Get rid of [Callback] extended attribute for parameters in IDL files

Source/modules/quota/StorageQuota.idl

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
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 [
     ImplementationLacksVTable
 ] interface StorageQuota {
-    [CallWith=ScriptExecutionContext] void queryUsageAndQuota([Callback] StorageUsageCallback usageCallback, [Callback] optional StorageErrorCallback errorCallback);
-    [CallWith=ScriptExecutionContext] void requestQuota(unsigned long long newQuotaInBytes, [Callback] optional StorageQuotaCallback quotaCallback, [Callback] optional StorageErrorCallback errorCallback);
+    [CallWith=ScriptExecutionContext] void queryUsageAndQuota(StorageUsageCallback usageCallback, optional StorageErrorCallback errorCallback);
+    [CallWith=ScriptExecutionContext] void requestQuota(unsigned long long newQuotaInBytes, optional StorageQuotaCallback quotaCallback, optional StorageErrorCallback errorCallback);
 };