Bug 1406829 (part 3) - Use [ptr] native for nsAtom pointers in .idl files. r=froydnj.

Even though it's more verbose because of the `%{C++` section, it's the proper
way to do this kind of thing, rather than faking it with `interface`.

dom/xul/templates/nsIXULTemplateBuilder.idl

@@ -5,7 +5,6 @@
 
 #include "domstubs.idl"
 
-interface nsAtom;  // not a real interface; used in [noscript] methods only
 interface nsIContent;
 interface nsIXULBuilderListener;
 interface nsIXULTemplateResult;
@@ -15,6 +14,11 @@ interface nsIRDFResource;
 interface nsIRDFCompositeDataSource;
 interface nsIDOMDataTransfer;
 
+%{C++
+class nsAtom;
+%}
+[ptr] native nsAtomPtr(nsAtom);
+
 /**
  * A template builder, given an input source of data, a template, and a
  * reference point, generates a list of results from the input, and copies
@@ -268,7 +272,7 @@ interface nsIXULTemplateBuilder : nsISupports
      * @param aTag tag that must match
      */
     [noscript] boolean hasGeneratedContent(in nsIRDFResource aNode,
-                                           in nsAtom aTag);
+                                           in nsAtomPtr aTag);
 
     /**
      * Adds a rule filter for a given rule, which may be used for specialized

dom/xul/templates/nsIXULTemplateQueryProcessor.idl

@@ -5,13 +5,17 @@
 
 #include "domstubs.idl"
 
-interface nsAtom;  // not a real interface; used in [noscript] methods only
 interface nsIArray;
 interface nsISimpleEnumerator;
 interface nsIXULTemplateResult;
 interface nsIXULTemplateRuleFilter;
 interface nsIXULTemplateBuilder;
 
+%{C++
+class nsAtom;
+%}
+[ptr] native nsAtomPtr(nsAtom);
+
 /**
  * A query processor takes a template query and generates results for it given
  * a datasource and a reference point. There is a one-to-one relationship
@@ -164,8 +168,8 @@ interface nsIXULTemplateQueryProcessor : nsISupports
    */
   [noscript] nsISupports compileQuery(in nsIXULTemplateBuilder aBuilder,
                                       in nsIDOMNode aQuery,
-                                      in nsAtom aRefVariable,
-                                      in nsAtom aMemberVariable);
+                                      in nsAtomPtr aRefVariable,
+                                      in nsAtomPtr aMemberVariable);
 
   /**
    * Generate the results of a query and return them in an enumerator. The
@@ -223,8 +227,8 @@ interface nsIXULTemplateQueryProcessor : nsISupports
    * @param aExpr expression used to compute the value to assign
    */
   [noscript] void addBinding(in nsIDOMNode aRuleNode,
-                             in nsAtom aVar,
-                             in nsAtom aRef,
+                             in nsAtomPtr aVar,
+                             in nsAtomPtr aRef,
                              in AString aExpr);
 
   /**
@@ -271,6 +275,6 @@ interface nsIXULTemplateQueryProcessor : nsISupports
    */
    [noscript] int32_t compareResults(in nsIXULTemplateResult aLeft,
                                      in nsIXULTemplateResult aRight,
-                                     in nsAtom aVar,
+                                     in nsAtomPtr aVar,
                                      in unsigned long aSortHints);
 };

dom/xul/templates/nsIXULTemplateResult.idl

@@ -5,10 +5,14 @@
 
 #include "nsISupports.idl"
 
-interface nsAtom;  // not a real interface; used in [noscript] methods only
 interface nsIDOMNode;
 interface nsIRDFResource;
 
+%{C++
+class nsAtom;
+%}
+[ptr] native nsAtomPtr(nsAtom);
+
 /**
  * A single result generated from a template query. Each result is identified
  * by an id, which must be unique within the set of results produced from a
@@ -80,7 +84,7 @@ interface nsIXULTemplateResult : nsISupports
    *
    * @return the value for the variable or a null string if it has no value
    */
-  [noscript] AString getBindingFor(in nsAtom aVar);
+  [noscript] AString getBindingFor(in nsAtomPtr aVar);
 
   /**
    * Get an object value for a variable such as ?name for this result. 
@@ -93,7 +97,7 @@ interface nsIXULTemplateResult : nsISupports
    *
    * @return the value for the variable or null if it has no value
    */
-  [noscript] nsISupports getBindingObjectFor(in nsAtom aVar);
+  [noscript] nsISupports getBindingObjectFor(in nsAtomPtr aVar);
 
   /**
    * Indicate that a particular rule of a query has matched and that output

rdf/base/nsIRDFXMLSerializer.idl

@@ -7,7 +7,10 @@
 #include "nsISupports.idl"
 #include "nsIRDFDataSource.idl"
 
-interface nsAtom;  // not a real interface; used in [noscript] methods only
+%{C++
+class nsAtom;
+%}
+[ptr] native nsAtomPtr(nsAtom);
 
 [scriptable, uuid(8ae1fbf8-1dd2-11b2-bd21-d728069cca92)]
 interface nsIRDFXMLSerializer : nsISupports
@@ -24,5 +27,5 @@ interface nsIRDFXMLSerializer : nsISupports
      * @param aPrefix the attribute namespace prefix
      * @param aURI the namespace URI
      */
-    [noscript] void addNameSpace(in nsAtom aPrefix, in DOMString aURI);
+    [noscript] void addNameSpace(in nsAtomPtr aPrefix, in DOMString aURI);
 };

rdf/base/nsIRDFXMLSink.idl

@@ -12,7 +12,10 @@
 
 #include "nsISupports.idl"
 
-interface nsAtom;  // not a real interface; used in [noscript] methods only
+%{C++
+class nsAtom;
+%}
+[ptr] native nsAtomPtr(nsAtom);
 
 // XXX Until these get scriptable. See nsIRDFXMLSink::AddNameSpace()
 [ref] native nsStringRef(nsString);
@@ -102,7 +105,7 @@ interface nsIRDFXMLSink : nsISupports
      * @param aPrefix the namespace prefix
      * @param aURI the namespace URI
      */
-    [noscript] void addNameSpace(in nsAtom aPrefix,
+    [noscript] void addNameSpace(in nsAtomPtr aPrefix,
                                  [const] in nsStringRef aURI);
 
     /**