Make most code on mac compile with enable_web_intents=0

chrome/chrome_browser_extensions.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.
 
 {
   'targets': [
     {
       'target_name': 'browser_extensions',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 789 matching lines @@
             ['include', '^browser/extensions/api/web_request/web_request_api_constants.cc'],
             ['include', '^browser/extensions/api/web_request/web_request_api_helpers.cc'],
             ['include', '^browser/extensions/api/web_request/web_request_permissions.cc'],
             ['include', '^browser/extensions/api/web_request/web_request_time_tracker.cc'],
           ],
           'dependencies!': [
             '../device/device.gyp:device_bluetooth',
             '../third_party/libusb/libusb.gyp:libusb'
           ],
         }],
+        ['enable_web_intents==0', {
+          'sources!': [
+            'browser/extensions/web_intents_parser.cc',
+            'browser/extensions/web_intents_parser.h',
+          ],
+        }],
         ['OS=="linux" and use_aura==1', {
           'dependencies': [
             '../build/linux/system.gyp:dbus',
             '../build/linux/system.gyp:fontconfig',
             '../build/linux/system.gyp:x11',
             '../dbus/dbus.gyp:dbus',
           ],
         }],
         ['toolkit_uses_gtk == 1', {
           'dependencies': [
@@ skipping 139 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/chromeos/contacts',
             'proto_out_dir': 'chrome/browser/chromeos/contacts',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],  # 'chromeos=1'
   ],  # 'conditions'
 }