Nuked WebFrameImplBase.

third_party/WebKit/Source/web/WebFrameImplBase.h

-// Copyright 2015 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 WebFrameImplBase_h
-#define WebFrameImplBase_h
-
-#include "platform/heap/Handle.h"
-#include "platform/wtf/text/AtomicString.h"
-#include "web/WebExport.h"
-
-namespace blink {
-
-class Frame;
-class FrameOwner;
-class Page;
-
-// WebFrameImplBase exists to avoid the diamond inheritance problem:
-// - The public interfaces WebLocalFrame/WebRemoteFrame extend WebFrame.
-// - WebLocalFrameImpl implements WebLocalFrame and WebRemoteFrameImpl
-//   implements WebRemoteFrame.
-// - The private implementations should share some functionality, but cannot
-//   inherit from a common base class inheriting WebFrame. This would result in
-//   WebFrame beind inherited from two different base classes.
-//
-// To get around this, only the private implementations have WebFrameImplBase as
-// a base class. WebFrame exposes a virtual accessor to retrieve the underlying
-// implementation as an instance of the base class, but has no inheritance
-// relationship with it. The cost is a virtual indirection, but this is nicer
-// than the previous manual dispatch emulating real virtual dispatch.
-class WEB_EXPORT WebFrameImplBase
-    : public GarbageCollectedFinalized<WebFrameImplBase> {
- public:
-  virtual ~WebFrameImplBase();
-
-  virtual void InitializeCoreFrame(Page&,
-                                   FrameOwner*,
-                                   const AtomicString& name) = 0;
-  // TODO(dcheng): Rename this to coreFrame()? This probably also shouldn't be
-  // const...
-  virtual Frame* GetFrame() const = 0;
-
-  DECLARE_VIRTUAL_TRACE();
-};
-
-}  // namespace blink
-
-#endif  // WebFrameImplBase_h