Move IDMap back to base/ where it is needed.

base/base.gyp

 # Copyright (c) 2009 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,
   },
   'includes': [
     '../build/common.gypi',
@@ skipping 132 matching lines @@
         'hmac_mac.cc',
         'hmac_nss.cc',
         'hmac_win.cc',
         'iat_patch.cc',
         'iat_patch.h',
         'icu_util.cc',
         'icu_util.h',
         'idle_timer.cc',
         'idle_timer.h',
         'idle_timer_none.cc',
+        'id_map.h',
         'image_util.cc',
         'image_util.h',
         'json_reader.cc',
         'json_reader.h',
         'json_writer.cc',
         'json_writer.h',
         'keyboard_codes.h',
         'keyboard_codes_win.h',
         'lazy_instance.cc',
         'lazy_instance.h',
@@ skipping 409 matching lines @@
         'file_util_unittest.cc',
         'file_version_info_unittest.cc',
         'gfx/jpeg_codec_unittest.cc',
         'gfx/native_theme_unittest.cc',
         'gfx/png_codec_unittest.cc',
         'gfx/rect_unittest.cc',
         'gmock_unittest.cc',
         'histogram_unittest.cc',
         'hmac_unittest.cc',
         'idletimer_unittest.cc',
+        'id_map_unittest.cc',
         'json_reader_unittest.cc',
         'json_writer_unittest.cc',
         'lazy_instance_unittest.cc',
         'leak_tracker_unittest.cc',
         'linked_list_unittest.cc',
         'linked_ptr_unittest.cc',
         'mac_util_unittest.cc',
         'message_loop_unittest.cc',
         'message_pump_glib_unittest.cc',
         'object_watcher_unittest.cc',
@@ skipping 243 matching lines @@
                 '<@(_outputs)',
               ],
               'message': 'Generating version information',
             },
           ],
         },
       ],
     }],
   ],
 }