Fix errors in display resolution change notifications

chrome/browser/chromeos/display/display_preferences_unittest.cc

Index: chrome/browser/chromeos/display/display_preferences_unittest.cc
diff --git a/chrome/browser/chromeos/display/display_preferences_unittest.cc b/chrome/browser/chromeos/display/display_preferences_unittest.cc
index e2cf68caabaeeb28fa3cca6e72e2413fe8f71706..0f35b28ad4b4e6e3ebfd06c7a81a00f68e5c0c08 100644
--- a/chrome/browser/chromeos/display/display_preferences_unittest.cc
+++ b/chrome/browser/chromeos/display/display_preferences_unittest.cc
@@ -574,10 +574,9 @@ TEST_F(DisplayPreferencesTest, PreventStore) {
       new display::ManagedDisplayMode(gfx::Size(400, 300)));
   scoped_refptr<display::ManagedDisplayMode> new_mode(
       new display::ManagedDisplayMode(gfx::Size(500, 400)));
-  if (shell->display_manager()->SetDisplayMode(id, new_mode)) {
-    shell->resolution_notification_controller()->PrepareNotification(
-        id, old_mode, new_mode, base::Closure());
-  }
+  EXPECT_TRUE(shell->resolution_notification_controller()
+                  ->PrepareNotificationAndSetDisplayMode(id, old_mode, new_mode,
+                                                         base::Closure()));
   UpdateDisplay("500x400#500x400|400x300|300x200");
 
   const base::DictionaryValue* properties =