Introduce ChromeZoomLevelPref, make zoom level prefs independent of profile prefs.

content/content_browser.gypi

 # 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../google_apis/google_apis.gyp:google_apis',
     '../net/net.gyp:net',
@@ skipping 213 matching lines @@
       'public/browser/web_ui.h',
       'public/browser/web_ui_controller.cc',
       'public/browser/web_ui_controller.h',
       'public/browser/web_ui_controller_factory.h',
       'public/browser/web_ui_data_source.h',
       'public/browser/url_data_source.cc',
       'public/browser/url_data_source.h',
       'public/browser/web_ui_message_handler.h',
       'public/browser/worker_service.h',
       'public/browser/worker_service_observer.h',
+      'public/browser/zoom_level_prefs_store.h',
       'public/browser/zygote_host_linux.h',
     ],
     'private_browser_sources': [
       'browser/accessibility/accessibility_mode_helper.cc',
       'browser/accessibility/accessibility_mode_helper.h',
       'browser/accessibility/accessibility_tree_formatter.cc',
       'browser/accessibility/accessibility_tree_formatter.h',
       'browser/accessibility/accessibility_tree_formatter_android.cc',
       'browser/accessibility/accessibility_tree_formatter_mac.mm',
       'browser/accessibility/accessibility_tree_formatter_utils_win.cc',
@@ skipping 1625 matching lines @@
       'sources': [
         'browser/media/cdm/browser_cdm_manager.cc',
         'browser/media/cdm/browser_cdm_manager.h',
         # This works on Android because enable_browser_cdms==1 on Android.
         'browser/media/media_web_contents_observer.cc',
         'browser/media/media_web_contents_observer.h',
       ],
     }],
   ],
 }