[bindings] Migrate V8TestingScope out of V8Binding.h/cpp

Source/bindings/core/v8/V8Binding.h

 /*
 * Copyright (C) 2009 Google Inc. All rights reserved.
 * Copyright (C) 2012 Ericsson AB. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
@@ skipping 981 matching lines @@
 
     virtual void requestInterrupt() override
     {
         m_isolate->RequestInterrupt(&onInterruptCallback, this);
     }
 
 private:
     v8::Isolate* m_isolate;
 };
 
-class V8TestingScope {
-public:
-    explicit V8TestingScope(v8::Isolate*);
-    ScriptState* scriptState() const;
-    v8::Isolate* isolate() const;
-    ~V8TestingScope();
-
-private:
-    v8::HandleScope m_handleScope;
-    v8::Context::Scope m_contextScope;
-    RefPtr<ScriptState> m_scriptState;
-};
-
 class DevToolsFunctionInfo final {
 public:
     explicit DevToolsFunctionInfo(v8::Handle<v8::Function>& function)
         : m_scriptId(0)
         , m_lineNumber(1)
         , m_function(function)
     {
         ASSERT(!m_function.IsEmpty());
     }
 
@@ skipping 34 matching lines @@
 
 // Callback functions used by generated code.
 void v8ConstructorAttributeGetterAsProperty(v8::Local<v8::Name> propertyName, const v8::PropertyCallbackInfo<v8::Value>&);
 void v8ConstructorAttributeGetterAsAccessor(const v8::FunctionCallbackInfo<v8::Value>&);
 
 typedef void (*InstallTemplateFunction)(v8::Local<v8::FunctionTemplate>, v8::Isolate*);
 
 } // namespace blink
 
 #endif // V8Binding_h