Allow any order for ExtAttrs and const in WebKit.
Allow any order for ExtAttrs and const in WebKit.

ExtAttrs followed by const variant has been recently added into WebKit.

Review URL: https://chromiumcodereview.appspot.com//9624004

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@5107 260f80e4-7a28-3924-810f-c04153c831b5

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