Reduce FOR_EACH_OBSERVER macro usage in chrome/browser

chrome/browser/media/webrtc/media_capture_devices_dispatcher.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/media/webrtc/media_capture_devices_dispatcher.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 304 matching lines @@
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(
           &MediaCaptureDevicesDispatcher::OnCreatingAudioStreamOnUIThread,
           base::Unretained(this), render_process_id, render_frame_id));
 }
 
 void MediaCaptureDevicesDispatcher::NotifyAudioDevicesChangedOnUIThread() {
   MediaStreamDevices devices = GetAudioCaptureDevices();
-  FOR_EACH_OBSERVER(Observer, observers_,
-                    OnUpdateAudioDevices(devices));
+  for (auto& observer : observers_)
+    observer.OnUpdateAudioDevices(devices);
 }
 
 void MediaCaptureDevicesDispatcher::NotifyVideoDevicesChangedOnUIThread() {
   MediaStreamDevices devices = GetVideoCaptureDevices();
-  FOR_EACH_OBSERVER(Observer, observers_,
-                    OnUpdateVideoDevices(devices));
+  for (auto& observer : observers_)
+    observer.OnUpdateVideoDevices(devices);
 }
 
 void MediaCaptureDevicesDispatcher::UpdateMediaRequestStateOnUIThread(
     int render_process_id,
     int render_frame_id,
     int page_request_id,
     const GURL& security_origin,
     content::MediaStreamType stream_type,
     content::MediaRequestState state) {
   for (MediaAccessHandler* handler : media_access_handlers_) {
     if (handler->SupportsStreamType(stream_type, nullptr)) {
       handler->UpdateMediaRequestState(render_process_id, render_frame_id,
                                        page_request_id, stream_type, state);
       break;
     }
   }
 
 #if defined(OS_CHROMEOS)
   if (IsOriginForCasting(security_origin) && IsVideoMediaType(stream_type)) {
     // Notify ash that casting state has changed.
     if (state == content::MEDIA_REQUEST_STATE_DONE) {
       ash::Shell::GetInstance()->OnCastingSessionStartedOrStopped(true);
     } else if (state == content::MEDIA_REQUEST_STATE_CLOSING) {
       ash::Shell::GetInstance()->OnCastingSessionStartedOrStopped(false);
     }
   }
 #endif
 
-  FOR_EACH_OBSERVER(Observer, observers_,
-                    OnRequestUpdate(render_process_id,
-                                    render_frame_id,
-                                    stream_type,
-                                    state));
+  for (auto& observer : observers_) {
+    observer.OnRequestUpdate(render_process_id, render_frame_id, stream_type,
+                             state);
+  }
 }
 
 void MediaCaptureDevicesDispatcher::OnCreatingAudioStreamOnUIThread(
     int render_process_id,
     int render_frame_id) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  FOR_EACH_OBSERVER(Observer, observers_,
-                    OnCreatingAudioStream(render_process_id, render_frame_id));
+  for (auto& observer : observers_)
+    observer.OnCreatingAudioStream(render_process_id, render_frame_id);
 }
 
 bool MediaCaptureDevicesDispatcher::IsInsecureCapturingInProgress(
     int render_process_id,
     int render_frame_id) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 #if defined(ENABLE_EXTENSIONS)
   for (MediaAccessHandler* handler : media_access_handlers_) {
     if (handler->SupportsStreamType(content::MEDIA_DESKTOP_VIDEO_CAPTURE,
                                     nullptr) ||
@@ skipping 50 matching lines @@
 #if defined(ENABLE_EXTENSIONS)
   for (MediaAccessHandler* handler : media_access_handlers_) {
     if (handler->SupportsStreamType(stream_type, nullptr)) {
       ToCaptureAccessHandlerBase(handler)->UpdateCapturingLinkSecured(
           render_process_id, render_frame_id, page_request_id, is_secure);
       break;
     }
   }
 #endif
 }