Revert 137540 - Disable off-store extension installs by default. Also get rid of ExtensionService::…

chrome/browser/extensions/extension_service.h

Index: chrome/browser/extensions/extension_service.h
===================================================================
--- chrome/browser/extensions/extension_service.h	(revision 137574)
+++ chrome/browser/extensions/extension_service.h	(working copy)
@@ -168,6 +168,12 @@
   // settings are stored.
   static const char* kSyncExtensionSettingsDirectoryName;
 
+  // Determine if a given extension download should be treated as if it came
+  // from the gallery. Note that this is requires *both* that the download_url
+  // match and that the download was referred from a gallery page.
+  bool IsDownloadFromGallery(const GURL& download_url,
+                             const GURL& referrer_url);
+
   // Returns the Extension of hosted or packaged apps, NULL otherwise.
   const Extension* GetInstalledApp(const GURL& url);
 
@@ -367,6 +373,9 @@
   // an existing extension.
   virtual void SyncExtensionChangeIfNeeded(const Extension& extension) OVERRIDE;
 
+  // The App that represents the web store.
+  const Extension* GetWebStoreApp();
+
   // Returns true if |url| should get extension api bindings and be permitted
   // to make api calls. Note that this is independent of what extension
   // permissions the given extension has been granted.