Fix crash where a pending pointer lock would trigger a CHECK.

content/browser/web_contents/web_contents_impl.cc

 // Copyright (c) 2012 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/web_contents/web_contents_impl.h"
 
 #include <stddef.h>
 
 #include <cmath>
 #include <utility>
@@ skipping 1701 matching lines @@
     if (delegate_ && delegate_->EmbedsFullscreenWidget())
       delegate_->ExitFullscreenModeForTab(this);
     for (auto& observer : observers_)
       observer.DidDestroyFullscreenWidget();
     fullscreen_widget_process_id_ = ChildProcessHost::kInvalidUniqueID;
     fullscreen_widget_routing_id_ = MSG_ROUTING_NONE;
     if (fullscreen_widget_had_focus_at_shutdown_)
       view_->RestoreFocus();
   }
 
-  CHECK(mouse_lock_widget_ != render_widget_host);
+  if (mouse_lock_widget_)
+    LostMouseLock(mouse_lock_widget_);
 }
 
 void WebContentsImpl::RenderWidgetGotFocus(
     RenderWidgetHostImpl* render_widget_host) {
   // Notify the observers if an embedded fullscreen widget was focused.
   if (delegate_ && render_widget_host && delegate_->EmbedsFullscreenWidget() &&
       render_widget_host->GetView() == GetFullscreenRenderWidgetHostView()) {
     NotifyWebContentsFocused();
   }
 }
@@ skipping 3455 matching lines @@
   dialog_manager_ = dialog_manager;
 }
 
 void WebContentsImpl::RemoveBindingSet(const std::string& interface_name) {
   auto it = binding_sets_.find(interface_name);
   if (it != binding_sets_.end())
     binding_sets_.erase(it);
 }
 
 }  // namespace content