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

ash/system/screen_security/screen_share_observer.h

Index: ash/system/screen_security/screen_share_observer.h
diff --git a/ash/common/system/chromeos/screen_security/screen_share_observer.h b/ash/system/screen_security/screen_share_observer.h
similarity index 73%
rename from ash/common/system/chromeos/screen_security/screen_share_observer.h
rename to ash/system/screen_security/screen_share_observer.h
index fd8d8652187fd443514866d29fbf29b00d504952..99227b676a31f7c4dc3e5c4c62e8569705635fcf 100644
--- a/ash/common/system/chromeos/screen_security/screen_share_observer.h
+++ b/ash/system/screen_security/screen_share_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_SCREEN_SECURITY_SCREEN_SHARE_OBSERVER_H_
-#define ASH_COMMON_SYSTEM_CHROMEOS_SCREEN_SECURITY_SCREEN_SHARE_OBSERVER_H_
+#ifndef ASH_SYSTEM_SCREEN_SECURITY_SCREEN_SHARE_OBSERVER_H_
+#define ASH_SYSTEM_SCREEN_SECURITY_SCREEN_SHARE_OBSERVER_H_
 
 #include "base/callback.h"
 #include "base/strings/string16.h"
@@ -25,4 +25,4 @@ class ScreenShareObserver {
 
 }  // namespace ash
 
-#endif  // ASH_COMMON_SYSTEM_CHROMEOS_SCREEN_SECURITY_SCREEN_SHARE_OBSERVER_H_
+#endif  // ASH_SYSTEM_SCREEN_SECURITY_SCREEN_SHARE_OBSERVER_H_