Move fileapi-related files from webkit/common/ to storage/common/ and set up redirect headers

storage/storage_common.gyp

 # Copyright 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': {
     'chromium_code': 1,
   },
   'targets': [
     {
-      # GN version: //webkit/common:storage_common
+      # GN version: //storage/common
       'target_name': 'storage_common',
       'type': '<(component)',
       'variables': { 'enable_wexit_time_destructors': 1, },
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '<(DEPTH)/net/net.gyp:net',
         '<(DEPTH)/url/url.gyp:url_lib',
-        '<(DEPTH)/webkit/common/webkit_common.gyp:webkit_common',
       ],
       'defines': ['STORAGE_COMMON_IMPLEMENTATION'],
       'sources': [
+        'common/data_element.cc',
+        'common/data_element.h',
         'common/blob/blob_data.cc',
         'common/blob/blob_data.h',
         'common/blob/scoped_file.cc',
         'common/blob/scoped_file.h',
         'common/blob/shareable_file_reference.cc',
         'common/blob/shareable_file_reference.h',
         'common/database/database_connections.cc',
         'common/database/database_connections.h',
         'common/database/database_identifier.cc',
         'common/database/database_identifier.h',
         'common/fileapi/directory_entry.cc',
         'common/fileapi/directory_entry.h',
         'common/fileapi/file_system_info.cc',
         'common/fileapi/file_system_info.h',
         'common/fileapi/file_system_mount_option.h',
         'common/fileapi/file_system_types.h',
         'common/fileapi/file_system_util.cc',
         'common/fileapi/file_system_util.h',
         'common/quota/quota_status_code.cc',
         'common/quota/quota_status_code.h',
         'common/quota/quota_types.h',
         'common/storage_common_export.h',
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }