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In RTL mode a tab transitioning from non-pinned to pinned ends up with
no visible favicon. This cl fixes this problem, and also uses the
correct tab width to calculate the iconview's position in non-pinned
RTL mode.

Bug: 789347
Change-Id: I972ef71c47811f9b2a5cf6ca2ac5f2c654d0c2bc
Reviewed-on: https://chromium-review.googlesource.com/795151Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Jayson Adams <shrike@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521835}