PlzNavigate: properly execute BeforeUnload on renderer initiated navigations

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 "core/frame/FrameView.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/layout/LayoutObject.h"
@@ skipping 159 matching lines @@
     // code tries to access the document of a remote frame at the moment.
     return WebDocument();
 }
 
 WebPerformance WebRemoteFrameImpl::performance() const
 {
     NOTREACHED();
     return WebPerformance();
 }
 
-bool WebRemoteFrameImpl::dispatchBeforeUnloadEvent()
-{
-    NOTREACHED();
-    return false;
-}
-
 void WebRemoteFrameImpl::dispatchUnloadEvent()
 {
     NOTREACHED();
 }
 
 void WebRemoteFrameImpl::executeScript(const WebScriptSource&)
 {
     NOTREACHED();
 }
 
@@ skipping 496 matching lines @@
 
 WebRemoteFrameImpl::WebRemoteFrameImpl(WebTreeScopeType scope, WebRemoteFrameClient* client)
     : WebRemoteFrame(scope)
     , m_frameClient(RemoteFrameClientImpl::create(this))
     , m_client(client)
     , m_selfKeepAlive(this)
 {
 }
 
 } // namespace blink