Reduce usage of FOR_EACH_OBSERVER macro in content/browser

content/browser/appcache/appcache_host.cc

Index: content/browser/appcache/appcache_host.cc
diff --git a/content/browser/appcache/appcache_host.cc b/content/browser/appcache/appcache_host.cc
index 697b2bdf8d0432babc5b3fc057e7d9b22c49ac88..adcefe08f58db1828a62f8cf782ca04f340a1881 100644
--- a/content/browser/appcache/appcache_host.cc
+++ b/content/browser/appcache/appcache_host.cc
@@ -62,7 +62,8 @@ AppCacheHost::AppCacheHost(int host_id, AppCacheFrontend* frontend,
 
 AppCacheHost::~AppCacheHost() {
   service_->RemoveObserver(this);
-  FOR_EACH_OBSERVER(Observer, observers_, OnDestructionImminent(this));
+  for (auto& observer : observers_)
+    observer.OnDestructionImminent(this);
   if (associated_cache_.get())
     associated_cache_->UnassociateHost(this);
   if (group_being_updated_.get())
@@ -453,7 +454,8 @@ void AppCacheHost::FinishCacheSelection(
   else if (!pending_swap_cache_callback_.is_null())
     DoPendingSwapCache();
 
-  FOR_EACH_OBSERVER(Observer, observers_, OnCacheSelectionComplete(this));
+  for (auto& observer : observers_)
+    observer.OnCacheSelectionComplete(this);
 }
 
 void AppCacheHost::OnServiceReinitialized(