Rename PageActionIconView::Refresh() to Update()

This CL renames PageActionIconView::Refresh() to be Update().
This makes it more consistent with
PageActionIconContainer::UpdatePageActionIcon() and LocationBar methods
like UpdateSaveCreditCardIcon().

There are no behavioural changes in this CL.

Bug: 788051
Change-Id: I1d5d05cfc659d89a41480771e2415b261553263b
Reviewed-on: https://chromium-review.googlesource.com/1082064
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565135}
11 files changed