Re-enable rate limiting for Windows Crashpad

Chrome can get itself into crash loops that cause massive numbers of
uploads. We'd like to have UMA to see what we're dropping, but for
the time being, mitigate by re-instituting the Mac-style 1/hr upload
limit.

BUG=crashpad:23

Review-Url: https://codereview.chromium.org/2332103002
Cr-Commit-Position: refs/heads/master@{#418063}
(cherry picked from commit d922b3cacfcee6958d71de501a8ced7c25801965)

Review URL: https://codereview.chromium.org/2343283002 .

Cr-Commit-Position: refs/branch-heads/2840@{#398}
Cr-Branched-From: 1ae106dbab4bddd85132d5b75c670794311f4c57-refs/heads/master@{#414607}
1 file changed