Move GetVersionStringModifier() and GetChannel() from platform_util_* to chrome_version_info_*

chrome/chrome_common.gypi

 # Copyright (c) 2011 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.
 
 {
   'target_defaults': {
     'variables': {
       'chrome_common_target': 0,
     },
     'target_conditions': [
@@ skipping 20 matching lines @@
           'common/attributed_string_coder_mac.h',
           'common/attributed_string_coder_mac.mm',
           'common/auto_start_linux.cc',
           'common/auto_start_linux.h',
           'common/autofill_messages.h',
           'common/child_process_logging.h',
           'common/child_process_logging_linux.cc',
           'common/child_process_logging_mac.mm',
           'common/child_process_logging_win.cc',
           'common/chrome_version_info.cc',
+          'common/chrome_version_info_linux.cc',
+          'common/chrome_version_info_mac.mm',
+          'common/chrome_version_info_win.cc',
           'common/chrome_version_info.h',
           'common/content_settings.cc',
           'common/content_settings.h',
           'common/content_settings_helper.cc',
           'common/content_settings_helper.h',
           'common/content_settings_types.h',
           'common/external_ipc_fuzzer.h',
           'common/external_ipc_fuzzer.cc',
           'common/guid.cc',
           'common/guid.h',
@@ skipping 516 matching lines @@
           'configurations': {
             'Common_Base': {
               'msvs_target_platform': 'x64',
             },
           },
         },
       ],
     }],
   ],
 }