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* Replace map<View*, ... with map<Link*, ... since that more accurately
  captures the intent.  Add a type alias as well.
* Slight modifications to variable names and comments in advance of functional
  patch, to minimize its diff.

Bug: 1015717
Change-Id: If153e69129c2d66a9d12825bdaddfb7e9a1787f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884359
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710230}