binding: Retires ExceptionState::throwIfNeeded().

third_party/WebKit/Source/bindings/core/v8/custom/V8MutationObserverCustom.cpp

 /*
  * Copyright (C) 2011 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 28 matching lines @@
 #include "core/dom/MutationObserver.h"
 #include "core/dom/Node.h"
 
 namespace blink {
 
 void V8MutationObserver::constructorCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ConstructionContext, "MutationObserver", info.Holder(), info.GetIsolate());
     if (info.Length() < 1) {
         exceptionState.throwTypeError(ExceptionMessages::notEnoughArguments(1, info.Length()));
-        exceptionState.throwIfNeeded();
         return;
     }
 
     v8::Local<v8::Value> arg = info[0];
     if (!arg->IsFunction()) {
         exceptionState.throwTypeError("Callback argument must be a function");
-        exceptionState.throwIfNeeded();
         return;
     }
 
     v8::Local<v8::Object> wrapper = info.Holder();
 
     MutationCallback* callback = V8MutationCallback::create(v8::Local<v8::Function>::Cast(arg), wrapper, ScriptState::current(info.GetIsolate()));
     MutationObserver* observer = MutationObserver::create(callback);
 
     v8SetReturnValue(info, V8DOMWrapper::associateObjectWithWrapper(info.GetIsolate(), observer, &wrapperTypeInfo, wrapper));
 }
 
 void V8MutationObserver::visitDOMWrapper(v8::Isolate* isolate, ScriptWrappable* scriptWrappable, const v8::Persistent<v8::Object>& wrapper)
 {
     MutationObserver* observer = scriptWrappable->toImpl<MutationObserver>();
     HeapHashSet<Member<Node>> observedNodes = observer->getObservedNodes();
     for (HeapHashSet<Member<Node>>::iterator it = observedNodes.begin(); it != observedNodes.end(); ++it) {
         v8::UniqueId id(reinterpret_cast<intptr_t>(V8GCController::opaqueRootForGC(isolate, *it)));
         isolate->SetReferenceFromGroup(id, wrapper);
     }
 }
 
 } // namespace blink