Swarm fewer tests on CrWinClang.
Swarm fewer tests on CrWinClang.

The isolate step currently crashes if it needs to do too much work. Hopefully
it can handle browser_tests and content_browsertests.  If not, I'll remove
browser_tests too.

This reverts most of #311919.

BUG=446368,419862
TBR=jochen@chromium.org

Review URL: https://codereview.chromium.org/855083004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#311959}

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