[DevTools] Copy objects from debugger context to inspected context properly.

BUG=637594

Review-Url: https://codereview.chromium.org/2253643002
Cr-Commit-Position: refs/heads/master@{#412436}
void V8Debugger::v8DebugEventCallback(const v8::Debug::EventDetails& eventDetails)
{
    V8Debugger* thisPtr = toV8Debugger(eventDetails.GetCallbackData());
    thisPtr->handleV8DebugEvent(eventDetails);
}

void V8Debugger::v8DebugEventCallback(const v8::Debug::EventDetails& eventDetails)
{
    V8Debugger* thisPtr = toV8Debugger(eventDetails.GetCallbackData());
    thisPtr->handleV8DebugEvent(eventDetails);
}
