Replace extensions::ScopedPersistent with v8::UniquePersistent.

extensions/renderer/scoped_persistent.h

-// Copyright 2014 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.
-
-#ifndef EXTENSIONS_RENDERER_SCOPED_PERSISTENT_H_
-#define EXTENSIONS_RENDERER_SCOPED_PERSISTENT_H_
-
-#include "base/logging.h"
-#include "v8/include/v8.h"
-
-namespace extensions {
-
-// A v8::Persistent handle to a V8 value which destroys and clears the
-// underlying handle on destruction.
-template <typename T>
-class ScopedPersistent {
- public:
-  ScopedPersistent() {}
-
-  explicit ScopedPersistent(v8::Handle<T> handle) { reset(handle); }
-
-  ScopedPersistent(v8::Isolate* isolate, v8::Handle<T> handle) {
-    reset(isolate, handle);
-  }
-
-  ~ScopedPersistent() { reset(); }
-
-  void reset(v8::Isolate* isolate, v8::Handle<T> handle) {
-    if (!handle.IsEmpty())
-      handle_.Reset(isolate, handle);
-    else
-      reset();
-  }
-
-  void reset(v8::Handle<T> handle) { reset(GetIsolate(handle), handle); }
-
-  void reset() { handle_.Reset(); }
-
-  bool IsEmpty() const { return handle_.IsEmpty(); }
-
-  v8::Handle<T> NewHandle() const {
-    if (handle_.IsEmpty())
-      return v8::Local<T>();
-    return v8::Local<T>::New(GetIsolate(handle_), handle_);
-  }
-
-  v8::Handle<T> NewHandle(v8::Isolate* isolate) const {
-    if (handle_.IsEmpty())
-      return v8::Local<T>();
-    return v8::Local<T>::New(isolate, handle_);
-  }
-
-  template <typename P>
-  void SetWeak(P* parameters,
-               typename v8::WeakCallbackData<T, P>::Callback callback) {
-    handle_.SetWeak(parameters, callback);
-  }
-
- private:
-  template <typename U>
-  static v8::Isolate* GetIsolate(v8::Handle<U> object_handle) {
-    // Only works for v8::Object and its subclasses. Add specialisations for
-    // anything else.
-    if (!object_handle.IsEmpty())
-      return GetIsolate(object_handle->CreationContext());
-    return v8::Isolate::GetCurrent();
-  }
-  static v8::Isolate* GetIsolate(v8::Handle<v8::Context> context_handle) {
-    if (!context_handle.IsEmpty())
-      return context_handle->GetIsolate();
-    return v8::Isolate::GetCurrent();
-  }
-  static v8::Isolate* GetIsolate(
-      v8::Handle<v8::ObjectTemplate> template_handle) {
-    return v8::Isolate::GetCurrent();
-  }
-
-  v8::Persistent<T> handle_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScopedPersistent);
-};
-
-}  // namespace extensions
-
-#endif  // EXTENSIONS_RENDERER_SCOPED_PERSISTENT_H_