Move webrequest_constants.* to extensions/browser/api/declarative_webrequest/

chrome/chrome_browser_extensions.gypi

 # Copyright (c) 2013 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.
 
 {
   'variables': {
     'chrome_browser_extensions_chromeos_sources': [
       'browser/extensions/api/diagnostics/diagnostics_api.cc',
       'browser/extensions/api/diagnostics/diagnostics_api.h',
       'browser/extensions/api/diagnostics/diagnostics_api_chromeos.cc',
@@ skipping 183 matching lines @@
       'browser/extensions/api/declarative_content/content_rules_registry.cc',
       'browser/extensions/api/declarative_content/content_rules_registry.h',
       'browser/extensions/api/declarative_webrequest/request_stage.cc',
       'browser/extensions/api/declarative_webrequest/request_stage.h',
       'browser/extensions/api/declarative_webrequest/webrequest_action.cc',
       'browser/extensions/api/declarative_webrequest/webrequest_action.h',
       'browser/extensions/api/declarative_webrequest/webrequest_condition.cc',
       'browser/extensions/api/declarative_webrequest/webrequest_condition.h',
       'browser/extensions/api/declarative_webrequest/webrequest_condition_attribute.cc',
       'browser/extensions/api/declarative_webrequest/webrequest_condition_attribute.h',
-      'browser/extensions/api/declarative_webrequest/webrequest_constants.cc',
-      'browser/extensions/api/declarative_webrequest/webrequest_constants.h',
       'browser/extensions/api/declarative_webrequest/webrequest_rules_registry.cc',
       'browser/extensions/api/declarative_webrequest/webrequest_rules_registry.h',
       'browser/extensions/api/desktop_capture/desktop_capture_api.cc',
       'browser/extensions/api/desktop_capture/desktop_capture_api.h',
       'browser/extensions/api/developer_private/developer_private_api.cc',
       'browser/extensions/api/developer_private/developer_private_api.h',
       'browser/extensions/api/developer_private/entry_picker.cc',
       'browser/extensions/api/developer_private/entry_picker.h',
       'browser/extensions/api/dial/dial_api.cc',
       'browser/extensions/api/dial/dial_api.h',
@@ skipping 909 matching lines @@
           ],
         }, {  # use_brlapi==0
           'sources': [
             'browser/extensions/api/braille_display_private/braille_controller_stub.cc',
           ],
         }],
       ],
     },
   ],
 }