Bug 1017030 - Part 4: Replace AutoPushJSContext in nsJSContext::InitClasses. r=bholley

dom/base/nsJSEnvironment.cpp

@@ -39,6 +39,7 @@
 #include "nsXPCOMCIDInternal.h"
 #include "nsIXULRuntime.h"
 #include "nsTextFormatter.h"
+#include "ScriptSettings.h"
 
 #include "xpcpublic.h"
 
@@ -1632,7 +1633,9 @@ nsresult
 nsJSContext::InitClasses(JS::Handle<JSObject*> aGlobalObj)
 {
   JSOptionChangedCallback(js_options_dot_str, this);
-  AutoPushJSContext cx(mContext);
+  AutoJSAPI jsapi;
+  JSContext* cx = jsapi.cx();
+  JSAutoCompartment ac(cx, aGlobalObj);
 
   // Attempt to initialize profiling functions
   ::JS_DefineProfilingFunctions(cx, aGlobalObj);