Flip the true/false result of ScriptState::contextIsValid

Source/bindings/core/v8/V8MutationCallback.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 34 matching lines @@
     m_callback.setWeak(this, &setWeakCallback);
 }
 
 void V8MutationCallback::call(const WillBeHeapVector<RefPtrWillBeMember<MutationRecord> >& mutations, MutationObserver* observer)
 {
     if (!canInvokeCallback())
         return;
 
     v8::Isolate* isolate = m_scriptState->isolate();
 
-    if (m_scriptState->contextIsValid())
+    if (!m_scriptState->contextIsValid())
         return;
     ScriptState::Scope scope(m_scriptState.get());
 
     if (m_callback.isEmpty())
         return;
     v8::Handle<v8::Value> observerHandle = toV8(observer, m_scriptState->context()->Global(), isolate);
     if (observerHandle.IsEmpty()) {
         if (!isScriptControllerTerminating())
             CRASH();
         return;
     }
 
     if (!observerHandle->IsObject())
         return;
 
     v8::Handle<v8::Object> thisObject = v8::Handle<v8::Object>::Cast(observerHandle);
     v8::Handle<v8::Value> argv[] = { v8Array(mutations, m_scriptState->context()->Global(), isolate), observerHandle };
 
     v8::TryCatch exceptionCatcher;
     exceptionCatcher.SetVerbose(true);
     ScriptController::callFunction(executionContext(), m_callback.newLocal(isolate), thisObject, WTF_ARRAY_LENGTH(argv), argv, isolate);
 }
 
 void V8MutationCallback::setWeakCallback(const v8::WeakCallbackData<v8::Function, V8MutationCallback>& data)
 {
     data.GetParameter()->m_callback.clear();
 }
 
 } // namespace blink