Remove FOR_EACH_OBSERVER macro usage in chrome/browser/supervised_user

chrome/browser/content_settings/tab_specific_content_settings.cc

Index: chrome/browser/content_settings/tab_specific_content_settings.cc
diff --git a/chrome/browser/content_settings/tab_specific_content_settings.cc b/chrome/browser/content_settings/tab_specific_content_settings.cc
index 9b653b3d74fb3595f4d86b0e3adb7d1c47e1943f..1cb75700a645501b1c68d1bd58a5293155933d5f 100644
--- a/chrome/browser/content_settings/tab_specific_content_settings.cc
+++ b/chrome/browser/content_settings/tab_specific_content_settings.cc
@@ -114,8 +114,8 @@ TabSpecificContentSettings::TabSpecificContentSettings(WebContents* tab)
 }
 
 TabSpecificContentSettings::~TabSpecificContentSettings() {
-  FOR_EACH_OBSERVER(
-      SiteDataObserver, observer_list_, ContentSettingsDestroyed());
+  for (SiteDataObserver& observer : observer_list_)
+    observer.ContentSettingsDestroyed();
 }
 
 TabSpecificContentSettings* TabSpecificContentSettings::GetForFrame(
@@ -862,7 +862,8 @@ void TabSpecificContentSettings::RemoveSiteDataObserver(
 }
 
 void TabSpecificContentSettings::NotifySiteDataObservers() {
-  FOR_EACH_OBSERVER(SiteDataObserver, observer_list_, OnSiteDataAccessed());
+  for (SiteDataObserver& observer : observer_list_)
+    observer.OnSiteDataAccessed();
 }
 
 void TabSpecificContentSettings::ClearGeolocationContentSettings() {