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This change removes the use of transparency on the location bar when
modern is enabled. This simplifies the logic required to run animations
and fixes a flickering issue when entering and exiting the tab switcher.

This change also changes the background color of the asset to white.
This allows it to be easily tinted which will also be required for the
composited version.

BUG=803098,803091

Change-Id: Ia56660da21f615840f6ea2902a3252b8809d337f
Reviewed-on: https://chromium-review.googlesource.com/899772
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534839}