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

ash/common/system/tray/fixed_sized_image_view.h

Index: ash/common/system/tray/fixed_sized_image_view.h
diff --git a/ash/system/tray/fixed_sized_image_view.h b/ash/common/system/tray/fixed_sized_image_view.h
similarity index 79%
rename from ash/system/tray/fixed_sized_image_view.h
rename to ash/common/system/tray/fixed_sized_image_view.h
index fefd13b83d360b52f53b20627bfaa3fe798faceb..7f00613cdca957aa80fcec064e15d8ceab24df0e 100644
--- a/ash/system/tray/fixed_sized_image_view.h
+++ b/ash/common/system/tray/fixed_sized_image_view.h
@@ -2,10 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_SYSTEM_TRAY_FIXED_SIZED_IMAGE_VIEW_H_
-#define ASH_SYSTEM_TRAY_FIXED_SIZED_IMAGE_VIEW_H_
+#ifndef ASH_COMMON_SYSTEM_TRAY_FIXED_SIZED_IMAGE_VIEW_H_
+#define ASH_COMMON_SYSTEM_TRAY_FIXED_SIZED_IMAGE_VIEW_H_
 
-#include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "ui/views/controls/image_view.h"
 
@@ -30,4 +29,4 @@ class FixedSizedImageView : public views::ImageView {
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_TRAY_FIXED_SIZED_IMAGE_VIEW_H_
+#endif  // ASH_COMMON_SYSTEM_TRAY_FIXED_SIZED_IMAGE_VIEW_H_