Add an ASSERT about cross-world wrapper leakage into ScriptValue

Source/core/inspector/JavaScriptCallFrame.cpp

 /*
  * Copyright (c) 2010, 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 152 matching lines @@
     return result;
 }
 
 v8::Handle<v8::Object> JavaScriptCallFrame::innerCallFrame()
 {
     return m_callFrame.newLocal(m_isolate);
 }
 
 ScriptValue JavaScriptCallFrame::setVariableValue(ScriptState* scriptState, int scopeNumber, const String& variableName, const ScriptValue& newValue)
 {
+    ScriptState::Scope scriptScope(scriptState);
     v8::Handle<v8::Object> callFrame = m_callFrame.newLocal(m_isolate);
     v8::Handle<v8::Function> setVariableValueFunction = v8::Handle<v8::Function>::Cast(callFrame->Get(v8AtomicString(m_isolate, "setVariableValue")));
     v8::Handle<v8::Value> argv[] = {
         v8::Handle<v8::Value>(v8::Integer::New(m_isolate, scopeNumber)),
         v8String(m_isolate, variableName),
         newValue.v8Value()
     };
     return ScriptValue(scriptState, setVariableValueFunction->Call(callFrame, WTF_ARRAY_LENGTH(argv), argv));
 }
 
 } // namespace WebCore