Fix crash when destroying a RenderWidgetHost that holds the pointer

content/browser/frame_host/interstitial_page_impl.cc

 // Copyright 2013 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 "content/browser/frame_host/interstitial_page_impl.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 447 matching lines @@
 void InterstitialPageImpl::SelectAll() {
   FrameTreeNode* focused_node = frame_tree_.GetFocusedFrame();
   if (!focused_node)
     return;
 
   focused_node->current_frame_host()->Send(new InputMsg_SelectAll(
       focused_node->current_frame_host()->GetRoutingID()));
   RecordAction(base::UserMetricsAction("SelectAll"));
 }
 
+bool InterstitialPageImpl::HasMouseLock(
+    RenderWidgetHostImpl* render_widget_host) {
+  return false;
+}
+
 RenderViewHostDelegateView* InterstitialPageImpl::GetDelegateView() {
   return rvh_delegate_view_.get();
 }
 
 WebContents* InterstitialPageImpl::GetWebContents() const {
   return web_contents();
 }
 
 const GURL& InterstitialPageImpl::GetMainFrameLastCommittedURL() const {
   return url_;
@@ skipping 462 matching lines @@
 void InterstitialPageImpl::UnderlyingContentObserver::WebContentsDestroyed() {
   interstitial_->OnNavigatingAwayOrTabClosing();
 }
 
 TextInputManager* InterstitialPageImpl::GetTextInputManager() {
   return !web_contents_ ? nullptr : static_cast<WebContentsImpl*>(web_contents_)
                                         ->GetTextInputManager();
 }
 
 }  // namespace content