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

ash/system/bluetooth/bluetooth_observer.h

Index: ash/system/bluetooth/bluetooth_observer.h
diff --git a/ash/common/system/chromeos/bluetooth/bluetooth_observer.h b/ash/system/bluetooth/bluetooth_observer.h
similarity index 64%
rename from ash/common/system/chromeos/bluetooth/bluetooth_observer.h
rename to ash/system/bluetooth/bluetooth_observer.h
index f5cd4841719410d071f2f01d7158154fcc8af71a..1c1bf4fa4d0158f2ff4865ebe84ee93eb6484d89 100644
--- a/ash/common/system/chromeos/bluetooth/bluetooth_observer.h
+++ b/ash/system/bluetooth/bluetooth_observer.h
@@ -2,8 +2,8 @@
 // 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_BLUETOOTH_BLUETOOTH_OBSERVER_H_
-#define ASH_COMMON_SYSTEM_CHROMEOS_BLUETOOTH_BLUETOOTH_OBSERVER_H_
+#ifndef ASH_SYSTEM_BLUETOOTH_BLUETOOTH_OBSERVER_H_
+#define ASH_SYSTEM_BLUETOOTH_BLUETOOTH_OBSERVER_H_
 
 namespace ash {
 
@@ -17,4 +17,4 @@ class BluetoothObserver {
 
 }  // namespace ash
 
-#endif  // ASH_COMMON_SYSTEM_CHROMEOS_BLUETOOTH_BLUETOOTH_OBSERVER_H_
+#endif  // ASH_SYSTEM_BLUETOOTH_BLUETOOTH_OBSERVER_H_