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

ash/common/system/chromeos/network/network_portal_detector_observer.h

Index: ash/common/system/chromeos/network/network_portal_detector_observer.h
diff --git a/ash/system/network/network_portal_detector_observer.h b/ash/common/system/chromeos/network/network_portal_detector_observer.h
similarity index 66%
rename from ash/system/network/network_portal_detector_observer.h
rename to ash/common/system/chromeos/network/network_portal_detector_observer.h
index aa2b3949e903f33c0ef1ef8b93166b407e77b0ee..9bc743bf0e7903df1dac31294b59ed3f383438be 100644
--- a/ash/system/network/network_portal_detector_observer.h
+++ b/ash/common/system/chromeos/network/network_portal_detector_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_SYSTEM_NETWORK_NETWORK_PORTAL_DETECTOR_OBSERVER_H_
-#define ASH_SYSTEM_NETWORK_NETWORK_PORTAL_DETECTOR_OBSERVER_H_
+#ifndef ASH_COMMON_SYSTEM_CHROMEOS_NETWORK_NETWORK_PORTAL_DETECTOR_OBSERVER_H_
+#define ASH_COMMON_SYSTEM_CHROMEOS_NETWORK_NETWORK_PORTAL_DETECTOR_OBSERVER_H_
 
 #include <string>
 
@@ -20,4 +20,4 @@ class NetworkPortalDetectorObserver {
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_NETWORK_NETWORK_PORTAL_DETECTOR_OBSERVER_H_
+#endif  // ASH_COMMON_SYSTEM_CHROMEOS_NETWORK_NETWORK_PORTAL_DETECTOR_OBSERVER_H_