Handle termination/crashes of an extension hosted in the ExtensionDialog.

chrome/browser/ui/views/select_file_dialog_extension.h

Index: chrome/browser/ui/views/select_file_dialog_extension.h
diff --git a/chrome/browser/ui/views/select_file_dialog_extension.h b/chrome/browser/ui/views/select_file_dialog_extension.h
index 59f0ba294d79d881c151db088464721f193458a7..41e1117078a0bb053d83d95eb35387d07b9bb7a5 100644
--- a/chrome/browser/ui/views/select_file_dialog_extension.h
+++ b/chrome/browser/ui/views/select_file_dialog_extension.h
@@ -14,6 +14,7 @@
 #include "chrome/browser/ui/views/extensions/extension_dialog_observer.h"
 #include "ui/gfx/native_widget_types.h"  // gfx::NativeWindow
 
+class Browser;
 class ExtensionDialog;
 class RenderViewHost;
 
@@ -32,6 +33,7 @@ class SelectFileDialogExtension
 
   // ExtensionDialog::Observer implementation.
   virtual void ExtensionDialogClosing(ExtensionDialog* dialog) OVERRIDE;
+  virtual void ExtensionTerminated(ExtensionDialog* dialog) OVERRIDE;
 
   // Routes callback to appropriate SelectFileDialog::Listener based on
   // the owning |tab_id|.
@@ -83,6 +85,10 @@ class SelectFileDialogExtension
   // ID of the tab that spawned this dialog, used to route callbacks.
   int32 tab_id_;
 
+  // Cache a pointer to our owner browser. Since we're a child window of our
+  // owner browser, if this browser gets deleted, it will also close us.
+  Browser* owner_browser_;
+
   gfx::NativeWindow owner_window_;
 
   // We defer the callback into SelectFileDialog::Listener until the window