Bug 1349618 - Guard ExecutionContext::mSamplerRAII with the MOZ_GECKO_PROFILER macro. r=njn

dom/base/nsJSUtils.cpp

@@ -134,9 +134,12 @@ EvaluationExceptionToNSResult(JSContext* aCx)
 
 nsJSUtils::ExecutionContext::ExecutionContext(JSContext* aCx,
                                               JS::Handle<JSObject*> aGlobal)
-  : mSamplerRAII("nsJSUtils::ExecutionContext", /* PROFILER_LABEL */
-                 js::ProfileEntry::Category::JS, __LINE__)
-  , mCx(aCx)
+  :
+#ifdef MOZ_GECKO_PROFILER
+    mSamplerRAII("nsJSUtils::ExecutionContext", /* PROFILER_LABEL */
+                 js::ProfileEntry::Category::JS, __LINE__),
+#endif
+    mCx(aCx)
   , mCompartment(aCx, aGlobal)
   , mRetValue(aCx)
   , mScopeChain(aCx)

dom/base/nsJSUtils.h

@@ -68,8 +68,10 @@ public:
 
   // ExecutionContext is used to switch compartment.
   class MOZ_STACK_CLASS ExecutionContext {
+#ifdef MOZ_GECKO_PROFILER
     // Register stack annotations for the Gecko profiler.
     mozilla::SamplerStackFrameRAII mSamplerRAII;
+#endif
 
     JSContext* mCx;