Remove BackForwardClient, cleanup starting a history navigation

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 356 matching lines @@
 
 WebViewImpl::WebViewImpl(WebViewClient* client)
     : m_client(client)
     , m_autofillClient(0)
     , m_spellCheckClient(0)
     , m_chromeClientImpl(this)
     , m_contextMenuClientImpl(this)
     , m_dragClientImpl(this)
     , m_editorClientImpl(this)
     , m_inspectorClientImpl(this)
-    , m_backForwardClientImpl(this)
     , m_spellCheckerClientImpl(this)
     , m_storageClientImpl(this)
     , m_shouldAutoResize(false)
     , m_zoomLevel(0)
     , m_minimumZoomLevel(zoomFactorToZoomLevel(minTextSizeMultiplier))
     , m_maximumZoomLevel(zoomFactorToZoomLevel(maxTextSizeMultiplier))
     , m_doubleTapZoomPageScaleFactor(0)
     , m_doubleTapZoomPending(false)
     , m_enableFakePageScaleAnimationForTesting(false)
     , m_fakePageScaleAnimationPageScaleFactor(0)
@@ skipping 33 matching lines @@
     , m_userGestureObserved(false)
     , m_topControlsContentOffset(0)
     , m_topControlsLayoutHeight(0)
 {
     Page::PageClients pageClients;
     pageClients.chromeClient = &m_chromeClientImpl;
     pageClients.contextMenuClient = &m_contextMenuClientImpl;
     pageClients.editorClient = &m_editorClientImpl;
     pageClients.dragClient = &m_dragClientImpl;
     pageClients.inspectorClient = &m_inspectorClientImpl;
-    pageClients.backForwardClient = &m_backForwardClientImpl;
     pageClients.spellCheckerClient = &m_spellCheckerClientImpl;
     pageClients.storageClient = &m_storageClientImpl;
 
     m_page = adoptPtrWillBeNoop(new Page(pageClients));
     MediaKeysController::provideMediaKeysTo(*m_page, &m_mediaKeysClientImpl);
     provideSpeechRecognitionTo(*m_page, SpeechRecognitionClientProxy::create(client ? client->speechRecognizer() : 0));
     provideNavigatorContentUtilsTo(*m_page, NavigatorContentUtilsClientImpl::create(this));
 
     provideContextFeaturesTo(*m_page, ContextFeaturesClientImpl::create());
     DeviceOrientationInspectorAgent::provideTo(*m_page);
@@ skipping 4023 matching lines @@
     const PageScaleConstraints& constraints = m_pageScaleConstraintsSet.pageDefinedConstraints();
 
     if (!mainFrameImpl() || !mainFrameImpl()->frameView())
         return false;
 
     return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 } // namespace blink