Migrate startup URLs pref.

chrome/browser/prefs/pref_metrics_service.h

Index: chrome/browser/prefs/pref_metrics_service.h
diff --git a/chrome/browser/prefs/pref_metrics_service.h b/chrome/browser/prefs/pref_metrics_service.h
index 0badbf3b7068fc4a2d92e21eab86c7b006b6da17..dffaeff8d870cc9ac872963feb46e5c039695d98 100644
--- a/chrome/browser/prefs/pref_metrics_service.h
+++ b/chrome/browser/prefs/pref_metrics_service.h
@@ -87,11 +87,9 @@ class PrefMetricsService : public BrowserContextKeyedService {
                             const std::string& histogram_name,
                             const Value* value);
 
-  // Callback for a list pref change. Each item in the list
-  // is logged using the given histogram callback.
-  void LogListPrefChange(const LogHistogramValueCallback& item_callback,
-                         const std::string& histogram_name,
-                         const Value* value);
+  // Callback for a startup URLs pref change.
+  void LogStartupURLsPrefChange(const std::string& histogram_name,
+                                const Value* value);
 
   // Callback to receive a unique device_id.
   void GetDeviceIdCallback(const std::string& device_id);