Fix the issue that any tab/window closing hotkey will crash the Pepper Flash Fullscreen.

content/browser/renderer_host/render_widget_host_delegate.h

Index: content/browser/renderer_host/render_widget_host_delegate.h
diff --git a/content/browser/renderer_host/render_widget_host_delegate.h b/content/browser/renderer_host/render_widget_host_delegate.h
index 4f0243ba89f67df471e4a8ea4b74861fe0cc5bcd..4bf7b1a6a0ea6821d9b9f26a42c6d17c67aa258a 100644
--- a/content/browser/renderer_host/render_widget_host_delegate.h
+++ b/content/browser/renderer_host/render_widget_host_delegate.h
@@ -9,6 +9,7 @@
 
 namespace content {
 
+class RenderWidgetHostImpl;
 struct NativeWebKeyboardEvent;
 
 //
@@ -18,6 +19,9 @@ struct NativeWebKeyboardEvent;
 //  of the RenderWidgetHost.
 class CONTENT_EXPORT RenderWidgetHostDelegate {
  public:
+  // The RenderWidgetHostImpl is going to be deleted.

[jam, 2012/09/24 19:20:51]

nit: "RenderWidgetHost"

[yzshen1, 2012/09/24 19:56:18]

Done.

+  virtual void RenderWidgetDeleted(RenderWidgetHostImpl* render_widget_host) {}
+
   // Callback to give the browser a chance to handle the specified keyboard
   // event before sending it to the renderer.
   // Returns true if the |event| was handled. Otherwise, if the |event| would