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This change migrates the omnibox sizing, layout, text and colors to
match UX spec. Things like rounded corners are still missing.

Also, fix the UI testapp.

BUG=
R=bshe

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I96bc91c8c80d070dd3e09275d35eb61774468559
Reviewed-on: https://chromium-review.googlesource.com/801954Reviewed-by: Biao She <bshe@chromium.org>
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521049}