Make unload tests stable.

content/browser/renderer_host/render_widget_host_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 143 matching lines @@
   void ForwardWheelEvent(const blink::WebMouseWheelEvent& wheel_event) override;
   void ForwardKeyboardEvent(const NativeWebKeyboardEvent& key_event) override;
   void ForwardGestureEvent(
       const blink::WebGestureEvent& gesture_event) override;
   RenderProcessHost* GetProcess() const override;
   int GetRoutingID() const override;
   RenderWidgetHostViewBase* GetView() const override;
   bool IsLoading() const override;
   void ResizeRectChanged(const gfx::Rect& new_rect) override;
   void RestartHangMonitorTimeout() override;
+  void DisableHangMonitorForTesting() override;
   void SetIgnoreInputEvents(bool ignore_input_events) override;
   void WasResized() override;
   void AddKeyPressEventCallback(const KeyPressEventCallback& callback) override;
   void RemoveKeyPressEventCallback(
       const KeyPressEventCallback& callback) override;
   void AddMouseEventCallback(const MouseEventCallback& callback) override;
   void RemoveMouseEventCallback(const MouseEventCallback& callback) override;
   void GetWebScreenInfo(blink::WebScreenInfo* result) override;
   bool GetScreenColorProfile(std::vector<char>* color_profile) override;
   void HandleCompositorProto(const std::vector<uint8_t>& proto) override;
@@ skipping 635 matching lines @@
   base::TimeDelta new_content_rendering_delay_;
 
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_