[win] Remove 'installing...' icons from the app list if the install fails.

chrome/browser/ui/app_list/apps_model_builder.h

Index: chrome/browser/ui/app_list/apps_model_builder.h
diff --git a/chrome/browser/ui/app_list/apps_model_builder.h b/chrome/browser/ui/app_list/apps_model_builder.h
index 305bd941ae63f8b6463adafa9547ef0699a6a158..4f06ff309d9b86cd94b1d986fe5a0b0330de92f5 100644
--- a/chrome/browser/ui/app_list/apps_model_builder.h
+++ b/chrome/browser/ui/app_list/apps_model_builder.h
@@ -44,6 +44,9 @@ class AppsModelBuilder : public content::NotificationObserver,
   void OnDownloadProgress(const std::string& extension_id,
                           int percent_downloaded);
 
+  // Called when an extension fails to install.
+  void OnInstallFailure(const std::string& extension_id);
+
  private:
   typedef std::vector<ExtensionAppItem*> Apps;