Add ability to clear content licenses

ppapi/shared_impl/file_system_util.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 "ppapi/shared_impl/file_system_util.h"
 
 #include "base/logging.h"
+#include "ppapi/shared_impl/ppapi_constants.h"
 
 namespace ppapi {
 
 bool FileSystemTypeIsValid(PP_FileSystemType type) {
   return (type == PP_FILESYSTEMTYPE_LOCALPERSISTENT ||
           type == PP_FILESYSTEMTYPE_LOCALTEMPORARY ||
           type == PP_FILESYSTEMTYPE_EXTERNAL ||
           type == PP_FILESYSTEMTYPE_ISOLATED);
 }
 
 bool FileSystemTypeHasQuota(PP_FileSystemType type) {
   return (type == PP_FILESYSTEMTYPE_LOCALTEMPORARY ||
           type == PP_FILESYSTEMTYPE_LOCALPERSISTENT);
 }
 
 std::string IsolatedFileSystemTypeToRootName(
     PP_IsolatedFileSystemType_Private type) {
   switch (type) {
     case PP_ISOLATEDFILESYSTEMTYPE_PRIVATE_CRX:
       return "crxfs";
     case PP_ISOLATEDFILESYSTEMTYPE_PRIVATE_PLUGINPRIVATE:
-      return "pluginprivate";
+      return kPluginPrivateRootName;
     default:
       NOTREACHED() << type;
       return std::string();
   }
 }
 
 }  // namespace ppapi