Refactor fast/dom/location-hash.html to use hashchange events.
Refactor fast/dom/location-hash.html to use hashchange events.

content shell changed the timing that this test relied upon. Moving to an
event-driven loop rather than relying on the point at which 'setTimeout(..., 0)'
executes makes the test significantly more stable.

R=jochen@chromium.org

Review URL: https://codereview.chromium.org/16002002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@151081 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs