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The first call to PinUser32 needs to acquire the loader lock and is
therefore tagged as being a blocking call. This caused test failures
in headless_browsertests.exe because it happened to occur when blocking
calls were disallowed. Explicitly calling PinUser32 before blocking
calls are prohibited is already done in other test setups so this change
adds that to headless_test_launcher.cc and, through code inspection,
three other locations (to prevent future issues).

Bug: 1147063
Change-Id: I495602ab8f10eca0f756002afbee6d1b0417054c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2548350Reviewed-by: Mike Pinkerton <pinkerton@chromium.org>
Reviewed-by: Cliff Smolinsky <cliffsmo@microsoft.com>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832412}