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These fields of CompositorFrameMetadata are not used on other platforms:
 - |top_controls_height|,
 - |top_controls_shown_ratio|,
 - |bottom_controls_height|,
 - |bottom_controls_shown_ratio|.

BUG=859969

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ibe602785bf2214bd371b3ed64964f112e3c7f149
Reviewed-on: https://chromium-review.googlesource.com/1184237Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Mohsen Izadi <mohsen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586340}