[Bindings] Simplify V8PrivateProperty::Symbol methods

third_party/WebKit/Source/bindings/modules/v8/custom/V8IDBObserverCustom.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "bindings/modules/v8/V8IDBObserver.h"
 
 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8DOMWrapper.h"
 #include "bindings/core/v8/V8PrivateProperty.h"
 #include "bindings/modules/v8/IDBObserverCallback.h"
 
 namespace blink {
 
 void V8IDBObserver::constructorCustom(
     const v8::FunctionCallbackInfo<v8::Value>& info) {
-  ExceptionState exceptionState(
-      info.GetIsolate(), ExceptionState::ConstructionContext, "IDBObserver");
+  v8::Isolate* isolate = info.GetIsolate();
+  ExceptionState exceptionState(isolate, ExceptionState::ConstructionContext,
+                                "IDBObserver");
 
   if (UNLIKELY(info.Length() < 1)) {
     exceptionState.throwTypeError(
         ExceptionMessages::notEnoughArguments(1, info.Length()));
     return;
   }
 
   v8::Local<v8::Object> wrapper = info.Holder();
 
   if (!info[0]->IsFunction()) {
@@ skipping 14 matching lines @@
   ScriptState* scriptState = ScriptState::forReceiverObject(info);
   v8::Local<v8::Function> v8Callback = v8::Local<v8::Function>::Cast(info[0]);
   IDBObserverCallback* callback =
       IDBObserverCallback::create(scriptState, v8Callback);
   IDBObserver* observer = IDBObserver::create(callback);
   if (exceptionState.hadException())
     return;
   DCHECK(observer);
   // TODO(bashi): Don't set private property (and remove this custom
   // constructor) when we can trace correctly.
-  V8PrivateProperty::getIDBObserverCallback(info.GetIsolate())
-      .set(info.GetIsolate()->GetCurrentContext(), wrapper, v8Callback);
-  v8SetReturnValue(info,
-                   V8DOMWrapper::associateObjectWithWrapper(
-                       info.GetIsolate(), observer, &wrapperTypeInfo, wrapper));
+  V8PrivateProperty::getIDBObserverCallback(isolate).set(wrapper, v8Callback);
+  v8SetReturnValue(info, V8DOMWrapper::associateObjectWithWrapper(
+                             isolate, observer, &wrapperTypeInfo, wrapper));
 }
 
 }  // namespace blink