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This patch moves chrome/renderer/page_load_metrics to
components/page_load_metrics/renderer, and is mostly
moving the file, no feature change.

OWNER file has been move to components/page_load_metrics,
is changed to same as chrome/browser/page_load_metrics/OWNERS
components/page_load_metrics/common/OWNERS is deleted.

Bug: 995880
Change-Id: Idbd70e7dda295db2cacb0bdcad1c5ba13fb48fea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1773919
Commit-Queue: Tao Bai <michaelbai@chromium.org>
Reviewed-by: Cait Phillips <caitkp@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Bryan McQuade <bmcquade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691956}