Flip the true/false result of ScriptState::contextIsValid

Source/bindings/core/v8/ScriptState.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ScriptState_h
 #define ScriptState_h
 
 #include "bindings/core/v8/ScopedPersistent.h"
 #include "bindings/core/v8/V8PerContextData.h"
 #include "wtf/RefCounted.h"
@@ skipping 56 matching lines @@
     static ScriptState* forMainWorld(LocalFrame*);
 
     v8::Isolate* isolate() const { return m_isolate; }
     DOMWrapperWorld& world() const { return *m_world; }
     LocalDOMWindow* domWindow() const;
     virtual ExecutionContext* executionContext() const;
     virtual void setExecutionContext(ExecutionContext*);
 
     // This can return an empty handle if the v8::Context is gone.
     v8::Handle<v8::Context> context() const { return m_context.newLocal(m_isolate); }
-    bool contextIsValid() const { return m_context.isEmpty() || m_globalObjectDetached; }
+    bool contextIsValid() const { return !m_context.isEmpty() && !m_globalObjectDetached; }
     void detachGlobalObject();
     void clearContext() { return m_context.clear(); }
 
     V8PerContextData* perContextData() const { return m_perContextData.get(); }
     void disposePerContextData() { m_perContextData = nullptr; }
 
     bool evalEnabled() const;
     void setEvalEnabled(bool);
     ScriptValue getFromGlobalObject(const char* name);
 
@@ skipping 51 matching lines @@
     }
 
 private:
     RefPtr<ScriptState> m_scriptState;
     ScopedPersistent<v8::Context> m_context;
 };
 
 }
 
 #endif // ScriptState_h