Default zoom was never read from chrome://settings

chrome/test/base/testing_profile.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 CHROME_TEST_BASE_TESTING_PROFILE_H_
 #define CHROME_TEST_BASE_TESTING_PROFILE_H_
 
 #include <string>
 
 #include "base/files/scoped_temp_dir.h"
@@ skipping 262 matching lines @@
   void SetExtensionSpecialStoragePolicy(
       ExtensionSpecialStoragePolicy* extension_special_storage_policy);
 #endif
   ExtensionSpecialStoragePolicy* GetExtensionSpecialStoragePolicy() override;
   // TODO(ajwong): Remove this API in favor of directly retrieving the
   // CookieStore from the StoragePartition after ExtensionURLRequestContext
   // has been removed.
   net::CookieMonster* GetCookieMonster();
 
   PrefService* GetPrefs() override;
-
+  chrome::ChromeZoomLevelPrefs* GetZoomLevelPrefs() override;
   history::TopSites* GetTopSites() override;
   history::TopSites* GetTopSitesWithoutCreating() override;
 
   net::URLRequestContextGetter* GetMediaRequestContext() override;
   net::URLRequestContextGetter* GetMediaRequestContextForRenderProcess(
       int renderer_child_id) override;
   net::URLRequestContextGetter* GetRequestContextForExtensions() override;
   net::URLRequestContextGetter* GetMediaRequestContextForStoragePartition(
       const base::FilePath& partition_path,
       bool in_memory) override;
@@ skipping 123 matching lines @@
 
   // Weak pointer to a delegate for indicating that a profile was created.
   Delegate* delegate_;
 
   std::string profile_name_;
 
   scoped_ptr<policy::PolicyService> policy_service_;
 };
 
 #endif  // CHROME_TEST_BASE_TESTING_PROFILE_H_