Move string files in base/ to the string subdirectory.

base/base.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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 405 matching lines @@
           'sequence_checker_impl.cc',
           'sequence_checker_impl.h',
           'sequenced_task_runner.cc',
           'sequenced_task_runner.h',
           'sequenced_task_runner_helpers.h',
           'sha1.h',
           'sha1_portable.cc',
           'sha1_win.cc',
           'single_thread_task_runner.h',
           'stl_util.h',
-          'string_util.cc',
-          'string_util.h',
-          'string_util_constants.cc',
-          'string_util_posix.h',
-          'string_util_win.h',
-          'string16.cc',
-          'string16.h',
-          'stringprintf.cc',
-          'stringprintf.h',
           'strings/latin1_string_conversions.cc',
           'strings/latin1_string_conversions.h',
+          'strings/string16.cc',
+          'strings/string16.h',
           'strings/string_number_conversions.cc',
           'strings/string_split.cc',
           'strings/string_split.h',
           'strings/string_number_conversions.h',
           'strings/string_piece.cc',
           'strings/string_piece.h',
           'strings/string_tokenizer.h',
+          'strings/string_util.cc',
+          'strings/string_util.h',
+          'strings/string_util_constants.cc',
+          'strings/string_util_posix.h',
+          'strings/string_util_win.h',
           'strings/stringize_macros.h',
+          'strings/stringprintf.cc',
+          'strings/stringprintf.h',
           'strings/sys_string_conversions.h',
           'strings/sys_string_conversions_mac.mm',
           'strings/sys_string_conversions_posix.cc',
           'strings/sys_string_conversions_win.cc',
           'strings/utf_offset_string_conversions.cc',
           'strings/utf_offset_string_conversions.h',
           'strings/utf_string_conversion_utils.cc',
           'strings/utf_string_conversion_utils.h',
           'strings/utf_string_conversions.cc',
           'strings/utf_string_conversions.h',
@@ skipping 323 matching lines @@
             ],
             'sources!': [
               'event_recorder_stubs.cc',
               'files/file_path_watcher_kqueue.cc',
               'files/file_path_watcher_stub.cc',
               'message_pump_libevent.cc',
               'posix/file_descriptor_shuffle.cc',
               # Not using sha1_win.cc because it may have caused a
               # regression to page cycler moz.
               'sha1_win.cc',
-              'string16.cc',
+              'strings/string16.cc',
             ],
           },],
           ['<(use_ozone) == 1', {
             'sources!': [
               'message_pump_glib.cc',
               'message_pump_aurax11.cc',
             ]
           }],
           ['OS == "linux" and >(nacl_untrusted_build)==0', {
             'sources!': [
@@ skipping 32 matching lines @@
           ['<(use_system_nspr)==1 and >(nacl_untrusted_build)==0', {
             'sources/': [
               ['exclude', '^third_party/nspr/'],
             ],
           }],
         ],
       }],
     ],
   },
 }