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Collapse platform specific expectations for several tests.

A WPT import ran into trouble on Mac11 and wasn't able to get results
for that platform. It thus added duplicate expectations for all other
platforms for these tests, and on a subsequent import also added a Mac11
expectation. So each test had 7 distinct and identical expectations, one
for each platform. These can be collapsed into a platform-agnostic
expectation which will cover all platforms anyway.

Change-Id: Ib9810f4d42ac6420290170ac306045862253990e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2644562Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Commit-Queue: Luke Z <lpz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846169}