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Pull latest from https://github.com/webrtc/samples. In particular, this
includes
https://github.com/webrtc/samples/commit/583fc1a6efacd19d9485be381a8698d12748b671
which is a followup to
https://chromium.googlesource.com/chromium/src/+/4eab15e1d4e2c0c9e4a6369c9d65ac2f543d489a
to resolve the perf regressions in bug 1167426.

PS1 has all manual changes. PS3 is the result of:
$ ./tools/perf/page_sets/update_webrtc_cases
$ git restore tools/perf/page_sets/webrtc_cases/datatransfer.js
(Necessary because
https://chromium-review.googlesource.com/c/chromium/src/+/2579968 is not
present in the upstream yet.)

Tested locally on Mac with:
./tools/perf/run_benchmark run webrtc --browser=system
./tools/perf/run_benchmark run webrtc --browser=canary
./tools/perf/run_benchmark run webrtc --browser=exact --browser-executable=/Applications/Google\ Chrome\ Beta.app/Contents/MacOS/Google\ Chrome\ Beta

Bug: 1167426
Change-Id: I9d4605e8149dc5dafcfcee13cbfd3a7cd6d7b92c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2642360
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Auto-Submit: Ben Wagner aka dogben <benjaminwagner@google.com>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845784}