linux_aura: Three fixes for switching themes.

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 323 matching lines @@
 extern const char kEnableContinuousSpellcheck[];
 extern const char kSpeechRecognitionFilterProfanities[];
 extern const char kSpeechRecognitionTrayNotificationShownContexts[];
 extern const char kEnabledLabsExperiments[];
 extern const char kEnableAutoSpellCorrect[];
 extern const char kSavingBrowserHistoryDisabled[];
 extern const char kAllowDeletingBrowserHistory[];
 extern const char kForceSafeSearch[];
 extern const char kDeleteTimePeriod[];
 extern const char kLastClearBrowsingDataTime[];
-#if defined(TOOLKIT_GTK)
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 extern const char kUsesSystemTheme[];
 #endif
 extern const char kCurrentThemePackFilename[];
 extern const char kCurrentThemeID[];
 extern const char kCurrentThemeImages[];
 extern const char kCurrentThemeColors[];
 extern const char kCurrentThemeTints[];
 extern const char kCurrentThemeDisplayProperties[];
 extern const char kExtensionsUIDeveloperMode[];
 extern const char kExtensionToolbarSize[];
@@ skipping 575 matching lines @@
 extern const char kAppListAppLaunchCount[];
 
 extern const char kModuleConflictBubbleShown[];
 
 extern const char kDRMSalt[];
 extern const char kEnableDRM[];
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_