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

chrome/browser/chromeos/input_method/mock_candidate_window_controller.cc

 // 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.
 
 #include "chrome/browser/chromeos/input_method/mock_candidate_window_controller.h"
 
 namespace chromeos {
 namespace input_method {
 
 MockCandidateWindowController::MockCandidateWindowController()
@@ skipping 15 matching lines @@
     CandidateWindowController::Observer* observer) {
   ++remove_observer_count_;
   observers_.RemoveObserver(observer);
 }
 
 void MockCandidateWindowController::Hide() {
   ++hide_count_;
 }
 
 void MockCandidateWindowController::NotifyCandidateWindowOpened() {
-  FOR_EACH_OBSERVER(CandidateWindowController::Observer, observers_,
-                    CandidateWindowOpened());
+  for (auto& observer : observers_)
+    observer.CandidateWindowOpened();
 }
 
 void MockCandidateWindowController::NotifyCandidateWindowClosed() {
-  FOR_EACH_OBSERVER(CandidateWindowController::Observer, observers_,
-                    CandidateWindowClosed());
+  for (auto& observer : observers_)
+    observer.CandidateWindowClosed();
 }
 
 }  // namespace input_method
 }  // namespace chromeos