Wyatt Allen 43ddaf6b1c Set line number hash using replaceState
When clicking a line number in the diff view, set the URL hash using
`history.replaceState` rather than `history.pushState` to avoid an
additional history entry.

Bug: Issue 4820
Change-Id: If2101508a49ac15e955d2981f7c7f93f22d5b9f9
2016-10-27 10:51:07 -07:00
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