Reduce FOR_EACH_OBSERVER usage in extensions

extensions/browser/extension_icon_image.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 "extensions/browser/extension_icon_image.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/macros.h"
@@ skipping 145 matching lines @@
 
 void IconImage::AddObserver(Observer* observer) {
   observers_.AddObserver(observer);
 }
 
 void IconImage::RemoveObserver(Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
 IconImage::~IconImage() {
-  FOR_EACH_OBSERVER(Observer, observers_, OnExtensionIconImageDestroyed(this));
+  for (auto& observer : observers_)
+    observer.OnExtensionIconImageDestroyed(this);
   source_->ResetHost();
 }
 
 gfx::ImageSkiaRep IconImage::LoadImageForScaleFactor(
     ui::ScaleFactor scale_factor) {
   // Do nothing if extension is unloaded.
   if (!extension_)
     return gfx::ImageSkiaRep();
 
   const float scale = ui::GetScaleForScaleFactor(scale_factor);
@@ skipping 63 matching lines @@
 
   image_skia_.RemoveRepresentation(scale);
   image_skia_.AddRepresentation(rep);
 
   // Update the image to use the updated image skia.
   // It's a shame we have to do this because it means that all the other
   // representations stored on |image_| will be deleted, but unfortunately
   // there's no way to combine the storage of two images.
   image_ = gfx::Image(image_skia_);
 
-  FOR_EACH_OBSERVER(Observer, observers_, OnExtensionIconImageChanged(this));
+  for (auto& observer : observers_)
+    observer.OnExtensionIconImageChanged(this);
 }
 
 void IconImage::Observe(int type,
                         const content::NotificationSource& source,
                         const content::NotificationDetails& details) {
   DCHECK_EQ(type, extensions::NOTIFICATION_EXTENSION_REMOVED);
 
   const Extension* extension = content::Details<const Extension>(details).ptr();
 
   if (extension_.get() == extension)
     extension_ = nullptr;
 }
 
 }  // namespace extensions