Shard browser_tests on Linux ClangToT bots
Shard browser_tests on Linux ClangToT bots

BUG=none
NOTRY=true

Review URL: https://codereview.chromium.org/1645753003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#372087}

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