Move GetDocument method from WebFrame to WebLocalFrame.

third_party/WebKit/Source/core/exported/WebRemoteFrameImpl.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 WebRemoteFrameImpl_h
 #define WebRemoteFrameImpl_h
 
 #include "core/CoreExport.h"
 #include "core/frame/RemoteFrame.h"
 #include "core/frame/WebRemoteFrameBase.h"
@@ skipping 20 matching lines @@
   ~WebRemoteFrameImpl() override;
 
   // WebFrame methods:
   void Close() override;
   WebString AssignedName() const override;
   void SetName(const WebString&) override;
   WebSize ContentsSize() const override;
   bool HasVisibleContent() const override;
   WebRect VisibleContentRect() const override;
   WebView* View() const override;
-  WebDocument GetDocument() const override;
   WebPerformance Performance() const override;
   void StopLoading() override;
   void EnableViewSourceMode(bool enable) override;
   bool IsViewSourceModeEnabled() const override;
   void SetReferrerForRequest(WebURLRequest&, const WebURL& referrer) override;
   WebAssociatedURLLoader* CreateAssociatedURLLoader(
       const WebAssociatedURLLoaderOptions&) override;
   unsigned UnloadListenerCount() const override;
 
   // WebRemoteFrame methods:
@@ skipping 69 matching lines @@
 
 DEFINE_TYPE_CASTS(WebRemoteFrameImpl,
                   WebFrame,
                   frame,
                   frame->IsWebRemoteFrame(),
                   frame.IsWebRemoteFrame());
 
 }  // namespace blink
 
 #endif  // WebRemoteFrameImpl_h