Always initialize ExceptionCode
Always initialize ExceptionCode

One of our ExceptionCodePlaceholder constructors set the exception code but the other left it arbitrary.

BUG=

Review URL: https://chromiumcodereview.appspot.com/15820010

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@151622 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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