Make installed_loader UMA less wasteful.

chrome/common/extensions/sync_helper.cc

 // Copyright 2013 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.
 
 #include "chrome/common/extensions/sync_helper.h"
 
 #include "base/logging.h"
 #include "chrome/common/extensions/api/plugins/plugins_handler.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/manifest_url_handler.h"
@@ skipping 49 matching lines @@
     case Manifest::TYPE_LEGACY_PACKAGED_APP:
     case Manifest::TYPE_PLATFORM_APP:
       return SYNC_TYPE_APP;
 
     case Manifest::TYPE_UNKNOWN:
     // Confusingly, themes are actually synced.
     // TODO(yoz): Make this look less inconsistent.
     case Manifest::TYPE_THEME:
     case Manifest::TYPE_SHARED_MODULE:
       return SYNC_TYPE_NONE;
+
+    case Manifest::NUM_LOAD_TYPES:
+      NOTREACHED();
   }
   NOTREACHED();
   return SYNC_TYPE_NONE;
 }
 
 }  // namespace
 
 bool IsSyncable(const Extension* extension) {
   // TODO(akalin): Figure out if we need to allow some other types.
 
@@ skipping 13 matching lines @@
 bool IsSyncableExtension(const Extension* extension) {
   return GetSyncType(extension) == SYNC_TYPE_EXTENSION;
 }
 
 bool IsSyncableApp(const Extension* extension) {
   return GetSyncType(extension) == SYNC_TYPE_APP;
 }
 
 }  // namespace sync_helper
 }  // namespace extensions