Fix an ExtensionPopup crash on browser window close.

chrome/browser/extensions/browser_action_test_util.h

Index: chrome/browser/extensions/browser_action_test_util.h
diff --git a/chrome/browser/extensions/browser_action_test_util.h b/chrome/browser/extensions/browser_action_test_util.h
index 556661f52a9f0f3b3185442e35816673405dbe69..25c77c9e005e6ae4c24209d1ab29f97395989026 100644
--- a/chrome/browser/extensions/browser_action_test_util.h
+++ b/chrome/browser/extensions/browser_action_test_util.h
@@ -31,6 +31,9 @@ class BrowserActionTestUtil {
 #if defined(TOOLKIT_VIEWS)
   // Returns the ExtensionAction for the given index.
   ExtensionAction* GetExtensionAction(int index);
+
+  // Inspects the extension popup for the action at the given index.
+  void InspectPopup(int index);
 #endif
 
   // Returns whether the browser action at |index| has a non-null icon. Note