Bump timeout on testDepotTools to account for loaded machines.
Bump timeout on testDepotTools to account for loaded machines.

The machine running this test might be under a lot of load and take
longer than 30 seconds to run this test.

BUG=chromium:339119
TEST=Run the unit test.

Change-Id: I175a9330560aa5655c094e4e3487c8ff567827ba
Reviewed-on: https://chromium-review.googlesource.com/186193
Tested-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>
Reviewed-by: Matt Tennant <46e612415b446ccde19638e4035892001c237942@chromium.org>
Commit-Queue: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>

chadversary/chromiumos.chromite,chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite