Add ScriptValue.v8ValueUnsafe() to access the V8 value without cross-context access check.

Source/bindings/core/v8/ScriptDebugServer.cpp

Index: Source/bindings/core/v8/ScriptDebugServer.cpp
diff --git a/Source/bindings/core/v8/ScriptDebugServer.cpp b/Source/bindings/core/v8/ScriptDebugServer.cpp
index 964c8a4832652d6b08b95eacbaa68ce2e3837ff7..492079ab47e90a2c745c0965b042bfc863532b25 100644
--- a/Source/bindings/core/v8/ScriptDebugServer.cpp
+++ b/Source/bindings/core/v8/ScriptDebugServer.cpp
@@ -317,12 +317,12 @@ int ScriptDebugServer::frameCount()
     return 0;
 }
 
-PassRefPtrWillBeRawPtr<JavaScriptCallFrame> ScriptDebugServer::toJavaScriptCallFrame(const ScriptValue& value)
+PassRefPtrWillBeRawPtr<JavaScriptCallFrame> ScriptDebugServer::toJavaScriptCallFrameUnsafe(const ScriptValue& value)
 {
     if (value.isEmpty())
         return nullptr;
     ASSERT(value.isObject());
-    return V8JavaScriptCallFrame::toNative(v8::Handle<v8::Object>::Cast(value.v8Value()));
+    return V8JavaScriptCallFrame::toNative(v8::Handle<v8::Object>::Cast(value.v8ValueUnsafe()));
 }
 
 PassRefPtrWillBeRawPtr<JavaScriptCallFrame> ScriptDebugServer::wrapCallFrames(int maximumLimit, ScopeInfoDetails scopeDetails)