Aura on Android: Compile extensions gn target.

chrome/common/pref_names.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Constants for the names of various preferences, for easier changing.
 
 #ifndef CHROME_COMMON_PREF_NAMES_H_
 #define CHROME_COMMON_PREF_NAMES_H_
 
 #include <stddef.h>
@@ skipping 381 matching lines @@
 
 extern const char kLocalDiscoveryNotificationsEnabled[];
 
 extern const char kPushMessagingAppIdentifierMap[];
 
 extern const char kEasyUnlockAllowed[];
 extern const char kEasyUnlockEnabled[];
 extern const char kEasyUnlockPairing[];
 extern const char kEasyUnlockProximityRequired[];
 
-#if defined(ENABLE_EXTENSIONS) && !defined(OS_ANDROID) && !defined(OS_IOS)
+#if defined(ENABLE_EXTENSIONS)
 extern const char kCopresenceAuthenticatedDeviceId[];
 extern const char kCopresenceAnonymousDeviceId[];
 extern const char kToolbarIconSurfacingBubbleAcknowledged[];
 extern const char kToolbarIconSurfacingBubbleLastShowTime[];
 #endif
 
 #if defined(ENABLE_WEBRTC)
 extern const char kWebRTCMultipleRoutesEnabled[];
 extern const char kWebRTCNonProxiedUdpEnabled[];
 extern const char kWebRTCIPHandlingPolicy[];
@@ skipping 379 matching lines @@
 extern const char kAnimationPolicy[];
 #endif
 
 extern const char kBackgroundTracingLastUpload[];
 
 extern const char kAllowDinosaurEasterEgg[];
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_