Fix set-href-attribute-protocol.html
Fix set-href-attribute-protocol.html

This CL fixes a bug in http://src.chromium.org/viewvc/blink?view=revision&revision=151044.
Previously we created a StringUTF8Adaptor for a temporary String, which is bad
news bears because StringUTF8Adaptor is just an adaptor: it doesn't own its
storage. We need to use a non-temporary String to make sure the storage lasts
as long as the adaptor.

R=mkwst@chromium.org

Review URL: https://codereview.chromium.org/15794004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@151051 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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