Remove metrics in Browser.NonCriticalPath

All frames are in the critical path in Browser. i.e., smooth
does not take priority. So no data is reported in metrics
BeginMainFrameIntervalNotCritical2 and
BeginMainFrameQueueDurationNotCritical2.

BUG=856860

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ibd58bb31ebfdc21f0aae6f5feabbc22ed8fbbcf1
Reviewed-on: https://chromium-review.googlesource.com/1133427
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: Yi Xu <yiyix@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574313}
2 files changed