Remove ActiveDOMCallback::isScriptControllerTerminating

third_party/WebKit/Source/bindings/core/v8/V8MutationCallback.cpp

 /*
  * Copyright (C) 2013 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 45 matching lines @@
 
     v8::Isolate* isolate = m_scriptState->isolate();
 
     if (!m_scriptState->contextIsValid())
         return;
     ScriptState::Scope scope(m_scriptState.get());
 
     if (m_callback.isEmpty())
         return;
     v8::Local<v8::Value> observerHandle = toV8(observer, m_scriptState->context()->Global(), isolate);
-    if (observerHandle.IsEmpty()) {
-        if (!isScriptControllerTerminating())
-            CRASH();
-        return;
-    }
-
     if (!observerHandle->IsObject())
         return;
 
     v8::Local<v8::Object> thisObject = v8::Local<v8::Object>::Cast(observerHandle);
     v8::Local<v8::Value> v8Mutations = toV8(mutations, m_scriptState->context()->Global(), isolate);
     if (v8Mutations.IsEmpty())
         return;
     v8::Local<v8::Value> argv[] = { v8Mutations, observerHandle };
 
     v8::TryCatch exceptionCatcher(isolate);
     exceptionCatcher.SetVerbose(true);
     V8ScriptRunner::callFunction(m_callback.newLocal(isolate), getExecutionContext(), thisObject, WTF_ARRAY_LENGTH(argv), argv, isolate);
 }
 
 DEFINE_TRACE(V8MutationCallback)
 {
     MutationCallback::trace(visitor);
     ActiveDOMCallback::trace(visitor);
 }
 
 } // namespace blink