Replace FOR_EACH_OBSERVER in c/b/chromeos with range-based for

chrome/browser/chromeos/device/input_service_proxy.cc

 // 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.
 
 #include "chrome/browser/chromeos/device/input_service_proxy.h"
 
 #include "base/bind_helpers.h"
 #include "base/macros.h"
 #include "base/task_runner_util.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 128 matching lines @@
 }
 
 // static
 void InputServiceProxy::SetThreadIdForTesting(BrowserThread::ID thread_id) {
   InputServiceProxy::thread_identifier_ = thread_id;
 }
 
 void InputServiceProxy::OnDeviceAdded(
     const InputServiceLinux::InputDeviceInfo& info) {
   DCHECK(thread_checker_.CalledOnValidThread());
-  FOR_EACH_OBSERVER(Observer, observers_, OnInputDeviceAdded(info));
+  for (auto& observer : observers_)
+    observer.OnInputDeviceAdded(info);
 }
 
 void InputServiceProxy::OnDeviceRemoved(const std::string& id) {
   DCHECK(thread_checker_.CalledOnValidThread());
-  FOR_EACH_OBSERVER(Observer, observers_, OnInputDeviceRemoved(id));
+  for (auto& observer : observers_)
+    observer.OnInputDeviceRemoved(id);
 }
 
 }  // namespace chromeos