RC: Add the load duration to the chrome://discards page.

Also drop some unused styles while I was in there.

Bug: 874968
Change-Id: I44881e7b5eefd63db4d9999c37958ba825fe1cbf
Reviewed-on: https://chromium-review.googlesource.com/1228775
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592514}
4 files changed