Remove FOR_EACH_OBSERVER from arc/ since it's being deprecated

components/arc/intent_helper/link_handler_model_impl.cc

 // Copyright 2016 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 "components/arc/intent_helper/link_handler_model_impl.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 114 matching lines @@
     gfx::Image icon;
     const ActivityIconLoader::ActivityName activity(
         handlers_[i]->package_name, handlers_[i]->activity_name);
     const auto it = icons_.find(activity);
     if (it != icons_.end())
       icon = it->second.icon16;
     // Use the handler's index as an ID.
     ash::LinkHandlerInfo handler = {handlers_[i]->name.get(), icon, i};
     handlers.push_back(handler);
   }
-  FOR_EACH_OBSERVER(Observer, observer_list_, ModelChanged(handlers));
+  for (auto& observer : observer_list_)
+    observer.ModelChanged(handlers);
 }
 
 // static
 GURL LinkHandlerModelImpl::RewriteUrlFromQueryIfAvailableForTesting(
     const GURL& url) {
   return RewriteUrlFromQueryIfAvailable(url);
 }
 
 // static
 GURL LinkHandlerModelImpl::RewriteUrlFromQueryIfAvailable(const GURL& url) {
@@ skipping 11 matching lines @@
   if (!GetQueryValue(url, kKeyToFind, &value))
     return url;
 
   const GURL new_url(value);
   if (!new_url.is_valid())
     return url;
   return new_url;
 }
 
 }  // namespace arc