Fix inconsistency in browser shortcut handling when a BrowserAction popup is focused.

chrome/browser/extensions/extension_host.h

Index: chrome/browser/extensions/extension_host.h
diff --git a/chrome/browser/extensions/extension_host.h b/chrome/browser/extensions/extension_host.h
index 39a5ba47a1502608069ca997c52d76c0910f487e..324c0aad661e65d7b1a966762ee49866a3a3052a 100644
--- a/chrome/browser/extensions/extension_host.h
+++ b/chrome/browser/extensions/extension_host.h
@@ -197,7 +197,7 @@ class ExtensionHost : public content::WebContentsDelegate,
   // Platform specific implementation may override this method to handle the
   // event in platform specific way.
   virtual void UnhandledKeyboardEvent(
-      const content::NativeWebKeyboardEvent& event) {}
+      const content::NativeWebKeyboardEvent& event);
 
   // Returns true if we're hosting a background page.
   // This isn't valid until CreateRenderView is called.