[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 ca485a205e6676cc3eefac7ecb0f623e1b69ab2f..82dd1665be0df1d08a8319d5c30c287f0dd538d7 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.
@@ -81,10 +80,6 @@ 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;