Refactor sudden termination

content/common/frame_messages.h

Index: content/common/frame_messages.h
diff --git a/content/common/frame_messages.h b/content/common/frame_messages.h
index e69b0f1856efd7049c9b0fa7078de744226f4c75..361b83851faddb2426effebbb10ea0f60fa44327 100644
--- a/content/common/frame_messages.h
+++ b/content/common/frame_messages.h
@@ -840,6 +840,14 @@ IPC_MESSAGE_ROUTED0(FrameHostMsg_DidFirstVisuallyNonEmptyPaint)
 // See the comment in chrome/browser/ui/browser.h for more details.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_ToggleFullscreen, bool /* enter_fullscreen */)
 
+// Messages to signal the presence or absence of BeforeUnload or Unload handlers
+// for a frame. |present| is true if there is at least one of the concerned
+// handlers for the frame.
+IPC_MESSAGE_ROUTED1(FrameHostMsg_BeforeUnloadHandlersPresenceChanged,
+                    bool /* present */)
+IPC_MESSAGE_ROUTED1(FrameHostMsg_UnloadHandlersPresenceChanged,
+                    bool /* present */)
+
 #if defined(OS_MACOSX) || defined(OS_ANDROID)
 
 // Message to show/hide a popup menu using native controls.