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This can't be done by mucking with ShouldWindowContentsBeTransparent() as I
opriginally thought; update comment there to describe better why.

Instead, do this directly in TabStripImpl.

The net effect of this should be that on Win 10, the titlebar background color
will no longer show through the background tabs in the default theme; for white
titlebars, this should make active and inactive tabs a little easier to
distinguish.

BUG=none
TEST=none

Change-Id: I1b722ba7ce887a1a32470e794e04b436bc06c22b
Reviewed-on: https://chromium-review.googlesource.com/802522Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521075}