Drop the default layout_test batch size for *SAN builds to 40.
Drop the default layout_test batch size for *SAN builds to 40.

BUG=427569
TBR=dpranke@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/726943002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@185377 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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