ifdef includes and inline function that requires MOZILLA_INTERNAL_API, so that this header can be pulled in from a standalone extension (bug 334870). r+b181=darin.

modules/plugin/base/public/nsIPluginHost.idl

@@ -43,8 +43,10 @@
 
 %{C++
 #include "nsplugindefs.h"
+#ifdef MOZILLA_INTERNAL_API
 #include "nsString.h"
 #include "nsNetUtil.h"
+#endif
 #include "prlink.h"  // for PRLibrary
 %}
 
@@ -94,6 +96,7 @@ interface nsIPluginHost : nsIFactory
 };
 
 %{C++
+#ifdef MOZILLA_INTERNAL_API
 /**
  * Used for creating the correct input stream for plugins
  * We can either have raw data (with or without \r\n\r\n) or a path to a file (but it must be native!)
@@ -151,4 +154,5 @@ NS_NewPluginPostDataStream(nsIInputStream **result,
   }
   return rv;
 }
+#endif
 %}