Fix DevToolsBeforeUnloadTest and BrowserCloseManagerBrowserTest.

content/public/browser/render_frame_host.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_RENDER_FRAME_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_FRAME_HOST_H_
 
 #include <string>
 
 #include "base/callback_forward.h"
@@ skipping 223 matching lines @@
   virtual void ResumeBlockedRequestsForFrame() = 0;
 
 #if defined(OS_ANDROID)
   // Returns an InterfaceProvider for Java-implemented interfaces that are
   // scoped to this RenderFrameHost. This provides access to interfaces
   // implemented in Java in the browser process to C++ code in the browser
   // process.
   virtual service_manager::InterfaceProvider* GetJavaInterfaces() = 0;
 #endif  // OS_ANDROID
 
+  // Stops and disables the hang monitor for beforeunload. This avoids flakiness
+  // in tests that need to observe beforeunload dialogs, which could fail if the
+  // timeout skips the dialog.
+  virtual void DisableBeforeUnloadHangMonitorForTesting() = 0;
+
  private:
   // This interface should only be implemented inside content.
   friend class RenderFrameHostImpl;
   RenderFrameHost() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_FRAME_HOST_H_