[cros] System setting change is correctly reported to a single JS callback.

chrome/browser/ui/webui/options/chromeos/core_chromeos_options_handler.cc

Index: chrome/browser/ui/webui/options/chromeos/core_chromeos_options_handler.cc
diff --git a/chrome/browser/ui/webui/options/chromeos/core_chromeos_options_handler.cc b/chrome/browser/ui/webui/options/chromeos/core_chromeos_options_handler.cc
index 844a69236eade2df0dc3ea32c075f9881f260dd2..b7d6d0adca3f667e61d3632c36fec921ffbd9042 100644
--- a/chrome/browser/ui/webui/options/chromeos/core_chromeos_options_handler.cc
+++ b/chrome/browser/ui/webui/options/chromeos/core_chromeos_options_handler.cc
@@ -227,9 +227,11 @@ void CoreChromeOSOptionsHandler::NotifySettingsChanged(
     NOTREACHED();
     return;
   }
-  for (PreferenceCallbackMap::const_iterator iter =
-      pref_callback_map_.find(*setting_name);
-      iter != pref_callback_map_.end(); ++iter) {
+  std::pair<PreferenceCallbackMap::const_iterator,
+            PreferenceCallbackMap::const_iterator> range =
+      pref_callback_map_.equal_range(*setting_name);
+  for (PreferenceCallbackMap::const_iterator iter = range.first;
+      iter != range.second; ++iter) {
     const std::wstring& callback_function = iter->second;
     ListValue result_value;
     result_value.Append(base::Value::CreateStringValue(setting_name->c_str()));