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

chrome/browser/ui/BUILD.gn

 # 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.
 
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 
 gypi_values = exec_script("//build/gypi_to_gn.py",
                           [ rebase_path("../../chrome_browser_ui.gypi") ],
@@ skipping 43 matching lines @@
     "//components/password_manager/core/browser",
     "//components/resources",
     "//components/strings",
     "//components/update_client",
     "//content/public/browser",
     "//content/public/common",
     "//crypto",
     "//skia",
     "//third_party/cacheinvalidation",
     "//third_party/icu",
-    "//third_party/libusb",
     "//third_party/libxml",
     "//third_party/zlib",
     "//ui/accessibility",
     "//ui/base",
     "//ui/content_accelerators",
     "//ui/events",
     "//ui/events:gesture_detection",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/message_center",
@@ skipping 53 matching lines @@
 
   if (!is_android && !is_ios) {
     sources += rebase_path(gypi_values.chrome_browser_ui_non_mobile_sources,
                            ".",
                            "//chrome")
     sources +=
         rebase_path(gypi_values.chrome_browser_ui_omnibox_non_mobile_sources,
                     ".",
                     "//chrome")
     deps += [
+      "//components/copresence",
       "//device/bluetooth",
-      "//components/copresence",
+      "//third_party/libusb",
     ]
   }
 
   if (enable_basic_printing || enable_print_preview) {
     deps += [ "//printing" ]
   }
 
   if (enable_one_click_signin) {
     sources +=
         rebase_path(gypi_values.chrome_browser_ui_one_click_signin_sources,
@@ skipping 160 matching lines @@
   if (is_android) {
     deps += [
       "//chrome/browser:jni_headers",
       "//crypto:platform",
 
       #'../components/components.gyp:web_contents_delegate_android',  TODO(GYP)
     ]
     deps -= [
       "//chrome/browser/ui/views",
       "//components/feedback/proto",
-      "//third_party/libusb",
       "//ui/events",
     ]
     sources += rebase_path(gypi_values.chrome_browser_ui_android_sources,
                            ".",
                            "//chrome")
 
     defines += [ "CHROME_BUILD_ID=" + android_chrome_build_id ]
   }
 
   if (is_mac) {
@@ skipping 187 matching lines @@
     "//chrome/browser",
     "//content/public/browser",
     "//content/public/common",
     "//content/test:test_support",
     "//net:test_support",
     "//skia",
     "//testing/gtest",
     "//ui/base",
   ]
 }