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The default thread size for Chrome on 32-bit Windows is 1.5 MiB which is
overkill for the BrokerServicesBase thread. Address-space exhaustion can
be an issue for 32-bit Chrome, especially on 32-bit Windows, so this
change reduces the size to 0.5 MiB.

Bug: 981238, 1023804
Change-Id: I8cc90b506f3a14895f8e7a84fc0138c0e1d0775e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422685
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809550}