Update WebstoreInstaller to be ref counted.

chrome/browser/extensions/extension_service.h

Index: chrome/browser/extensions/extension_service.h
diff --git a/chrome/browser/extensions/extension_service.h b/chrome/browser/extensions/extension_service.h
index 4673c89fca6ee9169085ddcf85062a5ea31da2eb..dbe6278a533f5e1d1b0f7d40078a1cb58d2c150b 100644
--- a/chrome/browser/extensions/extension_service.h
+++ b/chrome/browser/extensions/extension_service.h
@@ -34,7 +34,6 @@
 #include "chrome/browser/extensions/external_extension_provider_interface.h"
 #include "chrome/browser/extensions/pending_extension_manager.h"
 #include "chrome/browser/extensions/sandboxed_extension_unpacker.h"
-#include "chrome/browser/extensions/webstore_installer.h"
 #include "chrome/browser/prefs/pref_change_registrar.h"
 #include "chrome/browser/sync/api/sync_change.h"
 #include "chrome/browser/sync/api/syncable_service.h"
@@ -206,7 +205,6 @@ class ExtensionService
   const FilePath& install_directory() const { return install_directory_; }
 
   AppsPromo* apps_promo() { return &apps_promo_; }
-  WebstoreInstaller* webstore_installer() { return &webstore_installer_; }
 
   // Whether this extension can run in an incognito window.
   virtual bool IsIncognitoEnabled(const std::string& extension_id) const;
@@ -797,9 +795,6 @@ class ExtensionService
   // Manages the promotion of the web store.
   AppsPromo apps_promo_;
 
-  // Coordinates the extension download and install process from the gallery.
-  WebstoreInstaller webstore_installer_;
-
   // Flag to make sure event routers are only initialized once.
   bool event_routers_initialized_;