Remove dependency of 'browser_ui' on 'libusb' when building for iOS

chrome/chrome_browser_ui.gypi

 # Copyright 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': {
     # There are two sections of sources:
     # * "Platform"-based sources (OS, toolkit, etc.)
     # * Feature/directory-based sources (e.g., history, printing)
 
@@ skipping 2655 matching lines @@
         '../components/components_strings.gyp:components_strings',
         '../content/content.gyp:content_browser',
         '../content/content.gyp:content_common',
         '../crypto/crypto.gyp:crypto',
         '../skia/skia.gyp:skia',
         '../sync/sync.gyp:sync',
         '../third_party/cacheinvalidation/cacheinvalidation.gyp:cacheinvalidation',
         '../third_party/cacheinvalidation/cacheinvalidation.gyp:cacheinvalidation_proto_cpp',
         '../third_party/icu/icu.gyp:icui18n',
         '../third_party/icu/icu.gyp:icuuc',
-        '../third_party/libusb/libusb.gyp:libusb',
         '../third_party/libxml/libxml.gyp:libxml',
         '../third_party/zlib/zlib.gyp:zlib',
         '../ui/accessibility/accessibility.gyp:accessibility',
         '../ui/base/ui_base.gyp:ui_base',
         '../ui/content_accelerators/ui_content_accelerators.gyp:ui_content_accelerators',
         '../ui/events/events.gyp:events',
         '../ui/events/events.gyp:gesture_detection',
         '../ui/gfx/gfx.gyp:gfx',
         '../ui/gfx/gfx.gyp:gfx_geometry',
         '../ui/message_center/message_center.gyp:message_center',
@@ skipping 224 matching lines @@
           'sources': [ '<@(chrome_browser_ui_android_linux_sources)' ],
         }],
         ['OS=="android"', {
           'dependencies': [
             '../components/components.gyp:web_contents_delegate_android',
             '../third_party/boringssl/boringssl.gyp:boringssl',
             'chrome_browser_jni_headers',
           ],
           'dependencies!': [
              '../components/components.gyp:feedback_proto',
-             '../third_party/libusb/libusb.gyp:libusb',
              '../ui/events/events.gyp:events',
              'chrome_browser_ui_views.gyp:browser_ui_views',
           ],
           'sources': [ '<@(chrome_browser_ui_android_sources)' ],
         }],
         ['OS=="mac"', {
           'sources': [ '<@(chrome_browser_ui_mac_sources)' ],
           'sources!': [
             # Task manager has its own sources list. Leave out the views one.
             'browser/ui/views/task_manager_view.cc',
@@ skipping 177 matching lines @@
           'dependencies': [
             '<(DEPTH)/extensions/components/extensions_components.gyp:javascript_dialog_extensions_client',
           ],
         }],
         ['OS=="win" and (chromium_win_pch==0 or syzyasan==1)', {
           'msvs_shard': 4,
         }],
         ['OS!="android" and OS!="ios"', {
           'dependencies': [
             '../device/bluetooth/bluetooth.gyp:device_bluetooth',
+            '../third_party/libusb/libusb.gyp:libusb',
           ],
           'sources': [
             '<@(chrome_browser_ui_non_mobile_sources)',
             '<@(chrome_browser_ui_omnibox_non_mobile_sources)',
           ],
         }],
       ],
     },
   ],
 }