Move page closing hang timer duties to its own timer.

content/browser/frame_host/render_frame_host_manager.h

Index: content/browser/frame_host/render_frame_host_manager.h
diff --git a/content/browser/frame_host/render_frame_host_manager.h b/content/browser/frame_host/render_frame_host_manager.h
index 9a7d3ad05e2731212b9050df87f51c47d4ab81b8..93a90b8428e7dae3d17697a6ba6cf4a64a65e59a 100644
--- a/content/browser/frame_host/render_frame_host_manager.h
+++ b/content/browser/frame_host/render_frame_host_manager.h
@@ -280,11 +280,6 @@ class CONTENT_EXPORT RenderFrameHostManager
   // which one so we tell both.
   void SetIsLoading(bool is_loading);
 
-  // Whether to close the tab or not when there is a hang during an unload
-  // handler. If we are mid-crosssite navigation, then we should proceed
-  // with the navigation instead of closing the tab.
-  bool ShouldCloseTabOnUnresponsiveRenderer();
-
   // Confirms whether we should close the page or navigate away.  This is called
   // before a cross-site request or before a tab/window is closed (as indicated
   // by the first parameter) to allow the appropriate renderer to approve or