Stop building FilePathWatcher on iOS.

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 672 matching lines @@
       },
       'conditions': [
         ['OS == "android"', {
           'dependencies': [
             'android/jni_generator/jni_generator.gyp:jni_generator_tests',
             '../testing/android/native_test.gyp:native_test_native_code',
           ],
         }],
         ['OS == "ios" and _toolset != "host"', {
           'sources/': [
+            # iOS does not support FilePathWatcher.
+            ['exclude', '^files/file_path_watcher_unittest\\.cc$'],
             # Only test the iOS-meaningful portion of memory and process_utils.
             ['exclude', '^memory/discardable_shared_memory_unittest\\.cc$'],
             ['exclude', '^memory/shared_memory_unittest\\.cc$'],
             ['exclude', '^process/memory_unittest'],
             ['exclude', '^process/process_unittest\\.cc$'],
             ['exclude', '^process/process_util_unittest\\.cc$'],
             ['include', '^process/process_util_unittest_ios\\.cc$'],
             # iOS does not use message_pump_libevent.
             ['exclude', '^message_loop/message_pump_libevent_unittest\\.cc$'],
           ],
@@ skipping 195 matching lines @@
       ],
       'sources': [
         'test/gtest_util.cc',
         'test/gtest_util.h',
         'test/gtest_xml_unittest_result_printer.cc',
         'test/gtest_xml_unittest_result_printer.h',
         'test/gtest_xml_util.cc',
         'test/gtest_xml_util.h',
         'test/histogram_tester.cc',
         'test/histogram_tester.h',
-        'test/icu_test_util.cc',
-        'test/icu_test_util.h',
+        'test/icu_test_util.cc',
+        'test/icu_test_util.h',
         'test/ios/wait_util.h',
         'test/ios/wait_util.mm',
         'test/launcher/test_launcher.cc',
         'test/launcher/test_launcher.h',
         'test/launcher/test_result.cc',
         'test/launcher/test_result.h',
         'test/launcher/test_results_tracker.cc',
         'test/launcher/test_results_tracker.h',
         'test/launcher/unit_test_launcher.cc',
         'test/launcher/unit_test_launcher.h',
@@ skipping 739 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'base_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }