Roll GTM from svn r705 to git hash 4018783.

ios/testing/ios_testing.gyp

 # Copyright 2014 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,
   },
   'targets': [
     {
       # GN version: //ios/testing:ocmock_support
       'target_name': 'ocmock_support',
       'type': 'static_library',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../third_party/ocmock/ocmock.gyp:ocmock',
         '../../third_party/google_toolbox_for_mac/google_toolbox_for_mac.gyp:google_toolbox_for_mac',
       ],
       'sources': [
         'ocmock_complex_type_helper.h',
         'ocmock_complex_type_helper.mm',
       ],
       'include_dirs': [
         '../..',
       ],
+      'export_dependent_settings': [
+        '../../third_party/google_toolbox_for_mac/google_toolbox_for_mac.gyp:google_toolbox_for_mac',
+      ],
     },
     {
       # GN version: //ios/testing:ocmock_support_unittest
       'target_name': 'ocmock_support_unittest',
       'type': 'executable',
       'variables': {
         'ios_product_name': '<(_target_name)',
       },
       'sources': [
         'ocmock_complex_type_helper_unittest.mm',
       ],
       'dependencies': [
         'ocmock_support',
         '../../base/base.gyp:run_all_unittests',
         '../../base/base.gyp:test_support_base',
         '../../testing/gmock.gyp:gmock',
         '../../testing/gtest.gyp:gtest',
         '../../testing/iossim/iossim.gyp:iossim#host',
         '../../third_party/ocmock/ocmock.gyp:ocmock',
       ],
       'include_dirs': [
         '../..',
       ],
       'xcode_settings': {'OTHER_LDFLAGS': ['-ObjC']},
     },
   ],
 }