Reduce FOR_EACH_OBSERVER macro usage in chrome/browser

chrome/browser/media/router/issue_manager.cc

 // Copyright 2015 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/router/issue_manager.h"
 
 #include <algorithm>
 
 #include "content/public/browser/browser_thread.h"
 
@@ skipping 77 matching lines @@
 
 void IssueManager::UnregisterObserver(IssuesObserver* observer) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   issues_observers_.RemoveObserver(observer);
 }
 
 void IssueManager::MaybeUpdateTopIssue() {
   const Issue* new_top_issue = nullptr;
 
   if (issues_.empty()) {
-    FOR_EACH_OBSERVER(IssuesObserver, issues_observers_,
-                      OnIssueUpdated(new_top_issue));
+    for (auto& observer : issues_observers_)
+      observer.OnIssueUpdated(new_top_issue);
     return;
   }
 
   // Select the first blocking issue in the list of issues.
   // If there are none, simply select the first issue in the list.
   new_top_issue = &(issues_.front());
   for (const auto& issue : issues_) {
     // The first blocking issue is of higher priority than the first issue.
     if (issue.is_blocking()) {
       new_top_issue = &issue;
       break;
     }
   }
 
   // If we've found a new top issue, then report it via the observer.
   if (new_top_issue->id() != top_issue_id_) {
     top_issue_id_ = new_top_issue->id();
-    FOR_EACH_OBSERVER(IssuesObserver, issues_observers_,
-                      OnIssueUpdated(new_top_issue));
+    for (auto& observer : issues_observers_)
+      observer.OnIssueUpdated(new_top_issue);
   }
 }
 
 }  // namespace media_router