Kasper Nilsson c59e88058e Add raw diff download link to PG diff-view
A dependent change added the ability to download a single file diff to
Gerrit. This change utilizes that new feature via a download link in the
diff-view.

Feature: Issue 4669
Change-Id: I87ef2324ff2cd7fab6eb4b2e066dd08defe7c4f0
2016-10-31 18:06:51 -07:00
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