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*) remove zero_top_border_height_ hack.
a) Always use fullscreen_visible_fraction_  in HeaderView::GetPreferredOnScreenHeight

Cleanup the debug code that I accidentally included in other CLs.

NonClientFrameController doesn't have use immersive in tablet behavior, os
I left it as is.

Browser frame already uses immersive condition to compute the height, so
no changes in browser frame code.

BUG=b/33693796
TEST=no functional change except for a) above. a) is covered by unittests.

Change-Id: Iae7c236426216a3c251de8e40a5ecd69831c0635
Reviewed-on: https://chromium-review.googlesource.com/999967Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550035}