Remove FOR_EACH_OBSERVER macro usage in chrome/browser/android

chrome/browser/android/thumbnail/thumbnail_cache.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/android/thumbnail/thumbnail_cache.h"
 
 #include <algorithm>
 #include <cmath>
 #include <utility>
 
@@ skipping 809 matching lines @@
       thumbnail->CreateUIResource();
 
     cache_.Put(tab_id, std::move(thumbnail));
     NotifyObserversOfThumbnailRead(tab_id);
   }
 
   ReadNextThumbnail();
 }
 
 void ThumbnailCache::NotifyObserversOfThumbnailRead(TabId tab_id) {
-  FOR_EACH_OBSERVER(
-      ThumbnailCacheObserver, observers_, OnFinishedThumbnailRead(tab_id));
+  for (ThumbnailCacheObserver& observer : observers_)
+    observer.OnFinishedThumbnailRead(tab_id);
 }
 
 void ThumbnailCache::RemoveOnMatchedTimeStamp(TabId tab_id,
                                               const base::Time& time_stamp) {
   // We remove the cached version if it matches the tab_id and the time_stamp.
   Thumbnail* thumbnail = cache_.Get(tab_id);
   Thumbnail* approx_thumbnail = approximation_cache_.Get(tab_id);
   if ((thumbnail && thumbnail->time_stamp() == time_stamp) ||
       (approx_thumbnail && approx_thumbnail->time_stamp() == time_stamp)) {
     Remove(tab_id);
@@ skipping 91 matching lines @@
   return std::make_pair(dst_bitmap, new_scale * scale);
 }
 
 void ThumbnailCache::OnMemoryPressure(
     base::MemoryPressureListener::MemoryPressureLevel level) {
   if (level == base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL) {
     cache_.Clear();
     approximation_cache_.Clear();
   }
 }