Prevent duplicate concurrent installs of the same extension

chrome/browser/ui/app_list/search/webstore/webstore_result.h

Index: chrome/browser/ui/app_list/search/webstore/webstore_result.h
diff --git a/chrome/browser/ui/app_list/search/webstore/webstore_result.h b/chrome/browser/ui/app_list/search/webstore/webstore_result.h
index 7be3d87000cf0f3d847dc92de53691ee838a3876..f507c9837e8cfa9c1f9e76c62f55aa701a21abaf 100644
--- a/chrome/browser/ui/app_list/search/webstore/webstore_result.h
+++ b/chrome/browser/ui/app_list/search/webstore/webstore_result.h
@@ -43,6 +43,10 @@ class WebstoreResult : public ChromeSearchResult,
   virtual ChromeSearchResultType GetType() OVERRIDE;
 
  private:
+  // Set the initial state and start observing both InstallObserver and
+  // ExtensionRegistryObserver.
+  void InitAndStartObserving();
+
   void UpdateActions();
   void SetDefaultDetails();
   void OnIconLoaded();
@@ -52,9 +56,6 @@ class WebstoreResult : public ChromeSearchResult,
   void LaunchCallback(extensions::webstore_install::Result result,
                       const std::string& error);
 
-  // Start observing both InstallObserver and ExtensionRegistryObserver.
-  void StartObserving();
-
   void StopObservingInstall();
   void StopObservingRegistry();
 
@@ -64,12 +65,10 @@ class WebstoreResult : public ChromeSearchResult,
   virtual void OnShutdown() OVERRIDE;
 
   // extensions::ExtensionRegistryObserver overides:
-  virtual void OnExtensionWillBeInstalled(
+  virtual void OnExtensionInstalled(
       content::BrowserContext* browser_context,
       const extensions::Extension* extension,
-      bool is_update,
-      bool from_ephemeral,
-      const std::string& old_name) OVERRIDE;
+      bool is_update) OVERRIDE;
   virtual void OnShutdown(extensions::ExtensionRegistry* registry) OVERRIDE;
 
   Profile* profile_;