Use list instead of pair to represent the set of displays.

chrome/browser/chromeos/policy/display_rotation_default_handler_browsertest.cc

Index: chrome/browser/chromeos/policy/display_rotation_default_handler_browsertest.cc
diff --git a/chrome/browser/chromeos/policy/display_rotation_default_handler_browsertest.cc b/chrome/browser/chromeos/policy/display_rotation_default_handler_browsertest.cc
index 0796ddfdc72911323778c557d9d39dea7717bf77..111defe94929cdffea5fc1c3ecbbac7018989509 100644
--- a/chrome/browser/chromeos/policy/display_rotation_default_handler_browsertest.cc
+++ b/chrome/browser/chromeos/policy/display_rotation_default_handler_browsertest.cc
@@ -56,10 +56,10 @@ gfx::Display::Rotation GetRotationOfSecondDisplay() {
         << "Requested rotation of second display while there was only one.";
     return gfx::Display::ROTATE_0;
   }
-  const ash::DisplayIdPair display_id_pair =
-      display_manager->GetCurrentDisplayIdPair();
+  const ash::DisplayIdList display_id_pair =
+      display_manager->GetCurrentDisplayIdList();
   const gfx::Display& second_display =
-      display_manager->GetDisplayForId(display_id_pair.second);
+      display_manager->GetDisplayForId(display_id_pair[1]);
   return second_display.rotation();
 }