mash: Move tray_constants.h and FixedSizedImageView to //ash/common

ash/common/system/tray/tray_constants.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ash/system/tray/tray_constants.h"
+#include "ash/common/system/tray/tray_constants.h"
 
-#include "ash/ash_switches.h"
 #include "third_party/skia/include/core/SkColor.h"
 
 namespace ash {
 
 const int kPaddingFromRightEdgeOfScreenBottomAlignment = 7;
 const int kPaddingFromBottomOfScreenBottomAlignment = 7;
 const int kPaddingFromOuterEdgeOfLauncherVerticalAlignment = 8;
 const int kPaddingFromInnerEdgeOfLauncherVerticalAlignment = 9;
 const int kPaddingFromBottomOfScreenVerticalAlignment = 10;
 
@@ skipping 60 matching lines @@
     (kNotificationIconWidth + kNotificationButtonWidth +
      (kTrayPopupPaddingHorizontal / 2) * 3);
 
 const int kTrayAvatarCornerRadius = 2;
 const int kTrayAvatarSize = 32;
 
 const int kTraySpacing = 4;
 const int kShelfItemHeight = 38;
 
 }  // namespace ash