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

chrome/browser/chromeos/drive/drive_integration_service.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/drive/drive_integration_service.h"
 
 #include "base/bind.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
@@ skipping 447 matching lines @@
   DCHECK(mount_points);
 
   bool success =
       mount_points->RegisterFileSystem(mount_point_name_,
                                        storage::kFileSystemTypeDrive,
                                        storage::FileSystemMountOption(),
                                        drive_mount_point);
 
   if (success) {
     logger_->Log(logging::LOG_INFO, "Drive mount point is added");
-    FOR_EACH_OBSERVER(DriveIntegrationServiceObserver, observers_,
-                      OnFileSystemMounted());
+    for (auto& observer : observers_)
+      observer.OnFileSystemMounted();
   }
 }
 
 void DriveIntegrationService::RemoveDriveMountPoint() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   if (!mount_point_name_.empty()) {
     job_list()->CancelAllJobs();
 
-    FOR_EACH_OBSERVER(DriveIntegrationServiceObserver, observers_,
-                      OnFileSystemBeingUnmounted());
+    for (auto& observer : observers_)
+      observer.OnFileSystemBeingUnmounted();
 
     storage::ExternalMountPoints* const mount_points =
         storage::ExternalMountPoints::GetSystemInstance();
     DCHECK(mount_points);
 
     mount_points->RevokeFileSystem(mount_point_name_);
     logger_->Log(logging::LOG_INFO, "Drive mount point is removed");
   }
 }
 
@@ skipping 173 matching lines @@
         profile, preference_watcher,
         NULL, std::string(), base::FilePath(), NULL);
   } else {
     service = factory_for_test_->Run(profile);
   }
 
   return service;
 }
 
 }  // namespace drive