chromeos: Move files in //ash/common to //ash, part 1

ash/system/tray_tracing.h

Index: ash/system/tray_tracing.h
diff --git a/ash/common/system/chromeos/tray_tracing.h b/ash/system/tray_tracing.h
similarity index 86%
rename from ash/common/system/chromeos/tray_tracing.h
rename to ash/system/tray_tracing.h
index 363fc0ccdf01b8b53be51c485a0074f251b49ea1..d32077b7343da0ec9ce0c80535f17470dc787ded 100644
--- a/ash/common/system/chromeos/tray_tracing.h
+++ b/ash/system/tray_tracing.h
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_COMMON_SYSTEM_CHROMEOS_TRAY_TRACING_H_
-#define ASH_COMMON_SYSTEM_CHROMEOS_TRAY_TRACING_H_
+#ifndef ASH_SYSTEM_TRAY_TRACING_H_
+#define ASH_SYSTEM_TRAY_TRACING_H_
 
 #include "ash/ash_export.h"
-#include "ash/common/system/tray/tray_image_item.h"
+#include "ash/system/tray/tray_image_item.h"
 #include "base/macros.h"
 
 namespace views {
@@ -51,4 +51,4 @@ class TrayTracing : public TrayImageItem, public TracingObserver {
 
 }  // namespace ash
 
-#endif  // ASH_COMMON_SYSTEM_CHROMEOS_TRAY_TRACING_H_
+#endif  // ASH_SYSTEM_TRAY_TRACING_H_