Remove IS_IOS checks in chrome/

chrome/browser/chrome_browser_main.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROME_BROWSER_MAIN_H_
 #define CHROME_BROWSER_CHROME_BROWSER_MAIN_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 127 matching lines @@
   // Please keep |shutdown_watcher| as the first object constructed, and hence
   // it is destroyed last.
   std::unique_ptr<ShutdownWatcherHelper> shutdown_watcher_;
 
   // Statistical testing infrastructure for the entire browser. nullptr until
   // |SetupFieldTrials()| is called.
   std::unique_ptr<base::FieldTrialList> field_trial_list_;
 
   ChromeBrowserFieldTrials browser_field_trials_;
 
-#if !defined(OS_ANDROID) && !defined(OS_IOS)
+#if !defined(OS_ANDROID)
   std::unique_ptr<WebUsbDetector> web_usb_detector_;
 #endif
 
   // Vector of additional ChromeBrowserMainExtraParts.
   // Parts are deleted in the inverse order they are added.
   std::vector<ChromeBrowserMainExtraParts*> chrome_extra_parts_;
 
   // A profiler that periodically samples stack traces. Used to sample startup
   // behavior.
   base::StackSamplingProfiler sampling_profiler_;
@@ skipping 30 matching lines @@
 
   // Members initialized in PreMainMessageLoopRun, needed in
   // PreMainMessageLoopRunThreadsCreated.
   PrefService* local_state_;
   base::FilePath user_data_dir_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainParts);
 };
 
 #endif  // CHROME_BROWSER_CHROME_BROWSER_MAIN_H_