Prevent DisplayPreferences from saving incorrect rotations.

ash/system/audio/tray_audio.cc

Index: ash/system/audio/tray_audio.cc
diff --git a/ash/system/audio/tray_audio.cc b/ash/system/audio/tray_audio.cc
index 21c2163c4d5606e2b2d098259490b23748710ede..aab719db2cbcd638d60bbc556f63d43b20a11c67 100644
--- a/ash/system/audio/tray_audio.cc
+++ b/ash/system/audio/tray_audio.cc
@@ -167,8 +167,10 @@ void TrayAudio::ChangeInternalSpeakerChannelMode() {
     const DisplayInfo& display_info =
         Shell::GetInstance()->display_manager()->GetDisplayInfo(
             gfx::Display::InternalDisplayId());
-    if (display_info.rotation() == gfx::Display::ROTATE_180)
+    if (display_info.Rotation(gfx::Display::ROTATION_SOURCE_ACTIVE) ==
+        gfx::Display::ROTATE_180) {
       channel_mode = system::TrayAudioDelegate::LEFT_RIGHT_SWAPPED;
+    }
   }
 
   audio_delegate_->SetInternalSpeakerChannelMode(channel_mode);