Bug 1119482, part 2 - Move HoldDropJSObjects.h from xpcom/glue to xpcom/base. r=froydnj

This will clear the way for a HoldDropJSObjects.cpp, as xpcom/glue seems to use weird linking rules.

--HG--
rename : xpcom/glue/HoldDropJSObjects.h => xpcom/base/HoldDropJSObjects.h

xpcom/base/moz.build

@@ -77,6 +77,7 @@ EXPORTS.mozilla += [
     'CycleCollectedJSRuntime.h',
     'Debug.h',
     'ErrorNames.h',
+    'HoldDropJSObjects.h',
     'LinuxUtils.h',
     'nsMemoryInfoDumper.h',
     'StackWalk.h',

xpcom/glue/moz.build

@@ -75,7 +75,6 @@ EXPORTS.mozilla += [
     'EnumeratedArrayCycleCollection.h',
     'FileUtils.h',
     'GenericFactory.h',
-    'HoldDropJSObjects.h',
     'IntentionalCrash.h',
     'Monitor.h',
     'Mutex.h',