Only release the pointer lock when the RenderWidgetHost being destroyed

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 1713 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();
   }
 
-  if (mouse_lock_widget_)
+  if (render_widget_host == 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 3646 matching lines @@
     RenderViewHost* render_view_host = RenderViewHost::From(render_widget_host);
     if (!render_view_host)
       continue;
     render_view_host_set.insert(render_view_host);
   }
   for (RenderViewHost* render_view_host : render_view_host_set)
     render_view_host->OnWebkitPreferencesChanged();
 }
 
 }  // namespace content