We had some code in the ReviewRequestPageView to expand any entries that

contain an element with the window's hash, but this was only looking at

children of the entry views. For review entries, the entry view's

element itself has the ID, so we weren't doing anything. The page would

scroll purely based on the browser's behavior.
This change makes it so we test both the entry's element as well as look

for any children of that element.
I've also put the actual scroll call into a requestAnimationFrame()

callback to allow the page to reflow if necessary when expanding the

entry, which helps do a better job if the entry being expanded is at the

bottom of the page.

Ran js-tests.
Opened pages with #reviewXXXX hashes in the URL and saw that the

  correct review was now expanded and scrolled to.