[Ash] Remove non-MD code from ImeListView and ImeListItemView

ash/common/system/tray/tray_constants.h

Index: ash/common/system/tray/tray_constants.h
diff --git a/ash/common/system/tray/tray_constants.h b/ash/common/system/tray/tray_constants.h
index 921fd58a2b1a782d1b7e1d589f61cc65b06d1f67..3fb67f5700f14ffee7b40ca6ca129a8e678c3a90 100644
--- a/ash/common/system/tray/tray_constants.h
+++ b/ash/common/system/tray/tray_constants.h
@@ -69,7 +69,6 @@ extern const int kTrayPopupLabelRightPadding;
 extern const int kTrayPopupDetailsIconWidth;
 extern const int kTrayPopupDetailsLabelExtraLeftMargin;
 extern const SkColor kTrayPopupHoverBackgroundColor;
-extern const int kTrayPopupScrollSeparatorHeight;
 extern const int kTrayRoundedBorderRadius;
 
 // The width of ToggleButton views including any border padding.
@@ -82,10 +81,6 @@ extern const SkColor kPublicAccountUserCardNameColor;
 
 extern const SkColor kHeaderBackgroundColor;
 
-extern const SkColor kBorderDarkColor;
-extern const SkColor kBorderLightColor;
-extern const SkColor kButtonStrokeColor;
-
 extern const SkColor kHeaderTextColorNormal;
 extern const SkColor kHeaderTextColorHover;