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From discussion on chromium-dev, it was decided to remove 'chrome'
namespace.

Bug: 289619
Change-Id: I7e424529d4dacd61e8c272f8c4261546db55407a
Reviewed-on: https://chromium-review.googlesource.com/768469
Commit-Queue: srirama chandra sekhar <srirama.m@samsung.com>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517046}