Revert of Rate limit programmatic update checks for extensions

extensions/browser/updater/extension_downloader.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_BROWSER_UPDATER_EXTENSION_DOWNLOADER_H_
 #define EXTENSIONS_BROWSER_UPDATER_EXTENSION_DOWNLOADER_H_
 
 #include <deque>
 #include <map>
 #include <set>
@@ skipping 28 matching lines @@
 
 struct UpdateDetails {
   UpdateDetails(const std::string& id, const base::Version& version);
   ~UpdateDetails();
 
   std::string id;
   base::Version version;
 };
 
 class ExtensionCache;
-class ExtensionDownloaderTestDelegate;
 class ExtensionUpdaterTest;
 
 // A class that checks for updates of a given list of extensions, and downloads
 // the crx file when updates are found. It uses a |ExtensionDownloaderDelegate|
 // that takes ownership of the downloaded crx files, and handles events during
 // the update check.
 class ExtensionDownloader : public net::URLFetcherDelegate,
                             public OAuth2TokenService::Consumer {
  public:
   // A closure which constructs a new ExtensionDownloader to be owned by the
@@ skipping 48 matching lines @@
   }
 
   void set_ping_enabled_domain(const std::string& domain) {
     ping_enabled_domain_ = domain;
   }
 
   void set_enable_extra_update_metrics(bool enable) {
     enable_extra_update_metrics_ = enable;
   }
 
-  // Sets a test delegate to use by any instances of this class. The |delegate|
-  // should outlive all instances.
-  static void set_test_delegate(ExtensionDownloaderTestDelegate* delegate);
-
   // These are needed for unit testing, to help identify the correct mock
   // URLFetcher objects.
   static const int kManifestFetcherId = 1;
   static const int kExtensionFetcherId = 2;
 
   // Update AppID for extension blacklist.
   static const char kBlacklistAppID[];
 
   static const int kMaxRetries = 10;
 
@@ skipping 201 matching lines @@
 
   // Used to create WeakPtrs to |this|.
   base::WeakPtrFactory<ExtensionDownloader> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionDownloader);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_UPDATER_EXTENSION_DOWNLOADER_H_