Reduce usage of FOR_EACH_OBSERVER macro in chrome/browser

chrome/browser/memory/tab_manager.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/memory/tab_manager.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <set>
@@ skipping 472 matching lines @@
 // static
 int64_t TabManager::IdFromWebContents(WebContents* web_contents) {
   return reinterpret_cast<int64_t>(web_contents);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // TabManager, private:
 
 void TabManager::OnDiscardedStateChange(content::WebContents* contents,
                                         bool is_discarded) {
-  FOR_EACH_OBSERVER(TabManagerObserver, observers_,
-                    OnDiscardedStateChange(contents, is_discarded));
+  for (TabManagerObserver& observer : observers_)
+    observer.OnDiscardedStateChange(contents, is_discarded);
 }
 
 void TabManager::OnAutoDiscardableStateChange(content::WebContents* contents,
                                               bool is_auto_discardable) {
-  FOR_EACH_OBSERVER(
-      TabManagerObserver, observers_,
-      OnAutoDiscardableStateChange(contents, is_auto_discardable));
+  for (TabManagerObserver& observer : observers_)
+    observer.OnAutoDiscardableStateChange(contents, is_auto_discardable);
 }
 
 // static
 void TabManager::PurgeMemoryAndDiscardTab() {
   TabManager* manager = g_browser_process->GetTabManager();
   manager->PurgeBrowserMemory();
   manager->DiscardTab();
 }
 
 // static
@@ skipping 447 matching lines @@
   // platform.
   std::string allow_multiple_discards = variations::GetVariationParamValue(
       features::kAutomaticTabDiscarding.name, "AllowMultipleDiscards");
   return (allow_multiple_discards != "true");
 #else
   return false;
 #endif
 }
 
 }  // namespace memory