Move LaunchContainer enum to extension_constants.h.

extensions/common/constants.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.
 
 #ifndef EXTENSIONS_COMMON_CONSTANTS_H_
 #define EXTENSIONS_COMMON_CONSTANTS_H_
 
 #include "base/files/file_path.h"
 
 namespace extensions {
@@ skipping 65 matching lines @@
 extern const char kManagedSettingsDirectoryName[];
 
 // The name of the database inside the profile where chrome-internal
 // extension state resides.
 extern const char kStateStoreName[];
 
 // The name of the database inside the profile where declarative extension
 // rules are stored.
 extern const char kRulesStoreName[];
 
-// Don't remove items or change the order of this enum.  It's used in
-// histograms and preferences.
-// TODO(derat): Move this to chrome/browser/extensions/launch_util.h?
-enum LaunchContainer {
-  LAUNCH_WINDOW,
-  LAUNCH_PANEL,
-  LAUNCH_TAB,
-  // For platform apps, which don't actually have a container (they just get a
-  // "onLaunched" event).
-  LAUNCH_NONE
-};
-
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_CONSTANTS_H_