Enable MessageLoop unittests on iOS and fix MessagePumpIOForIOS bug.

base/base.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 600 matching lines @@
         }],
         ['OS == "ios"', {
           'sources/': [
             # Only test the iOS-meaningful portion of process_utils.
             ['exclude', '^process_util_unittest'],
             ['include', '^process_util_unittest_ios\\.cc$'],
             # Requires spawning processes.
             ['exclude', '^metrics/stats_table_unittest\\.cc$'],
             # iOS does not use message_pump_libevent.
             ['exclude', '^message_pump_libevent_unittest\\.cc$'],
-            # TODO(ios): Remove these as base/ is unforked.
-            # For now, exclude everything that doesn't build as-is, just to get
-            # a minimal target building.
-            # Unittests that don't pass.
-            ['exclude', '^message_loop_unittest\\.cc$'],
           ],
           'conditions': [
             ['coverage != 0', {
               'sources!': [
                 # These sources can't be built with coverage due to a toolchain
                 # bug: http://openradar.appspot.com/radar?id=1499403
                 'json/json_reader_unittest.cc',
                 'string_piece_unittest.cc',
 
                 # These tests crash when run with coverage turned on due to an
@@ skipping 468 matching lines @@
             'base_unittests.isolate',
           ],
           'sources': [
             'base_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }