Reland fix for OCSP startup race.
This is a revert of r62107 which is a revert of r62105 which is a revert of r60753 which is a revert of r60739 which is a revert of r60025 which is a revert of r59972 which is a revert of r59570 which is a revert of r59511 which is a revert of r59299 which is a revert of r59289.
The most recent reverts have all been due to ChromiumOS leaks which I believe to be fixed after fixing bug 58572, since I tested the combined fix in r62105 which was green on all ChromiumOS valgrind bots.
BUG=
55940
TEST=Run a debug build on Linux. 10% or so of startups used to crash on startup. Shouldn't happen anymore.
Committed:
http://src.chromium.org/viewvc/chrome?view=rev&revision=62256