Introduce WebRemoteFrameBase to break dependencies on WebRemoteFrameImpl.

third_party/WebKit/Source/web/WebRemoteFrameImpl.cpp

 // 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.
 
 #include "web/WebRemoteFrameImpl.h"
 
 #include "bindings/core/v8/WindowProxy.h"
 #include "core/dom/Fullscreen.h"
 #include "core/dom/RemoteSecurityContext.h"
 #include "core/dom/SecurityContext.h"
@@ skipping 33 matching lines @@
   WebRemoteFrameImpl* frame = new WebRemoteFrameImpl(scope, client);
   frame->SetOpener(opener);
   return frame;
 }
 
 WebRemoteFrameImpl::~WebRemoteFrameImpl() {}
 
 DEFINE_TRACE(WebRemoteFrameImpl) {
   visitor->Trace(frame_client_);
   visitor->Trace(frame_);
+  WebRemoteFrameBase::Trace(visitor);
   WebFrame::TraceFrames(visitor, this);
 }
 
 bool WebRemoteFrameImpl::IsWebLocalFrame() const {
   return false;
 }
 
 WebLocalFrame* WebRemoteFrameImpl::ToWebLocalFrame() {
   NOTREACHED();
   return nullptr;
@@ skipping 461 matching lines @@
 }
 
 v8::Local<v8::Object> WebRemoteFrameImpl::GlobalProxy() const {
   return GetFrame()
       ->GetWindowProxy(DOMWrapperWorld::MainWorld())
       ->GlobalProxyIfNotDetached();
 }
 
 WebRemoteFrameImpl::WebRemoteFrameImpl(WebTreeScopeType scope,
                                        WebRemoteFrameClient* client)
-    : WebRemoteFrame(scope),
+    : WebRemoteFrameBase(scope),
       frame_client_(RemoteFrameClientImpl::Create(this)),
       client_(client),
       self_keep_alive_(this) {}
 
 }  // namespace blink