Fix exceptions when running the tests.

Fix exceptions when running the tests.

-Make NetworkSimulator error when runTest calls are nested.
-Harden NetworkSimulator against exceptions.
-Fix incorrect nested runTest call in treestatus_unittests.js.
-Fix network requests in ct-results-by-builder-tests.html.

This exposes that some of the tests were not overriding net
and thus the tests now do a ton of network requests.
This will go away when https://codereview.chromium.org/402603007
lands, so it doesn't seem worth the effort to fix all the
broken cases.

NOTRY=true
R=abarth@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=178529

[ojan, 2014-07-20 06:51:23]

This depends on https://codereview.chromium.org/400423002.

[abarth-chromium, 2014-07-20 16:56:17]

lgtm

https://codereview.chromium.org/401163002/diff/1/Tools/GardeningServer/script...
File Tools/GardeningServer/scripts/net_unittests.js (right):

https://codereview.chromium.org/401163002/diff/1/Tools/GardeningServer/script...
Tools/GardeningServer/scripts/net_unittests.js:44: function
all_resolved(results) {
allResolved ?

[ojan, 2014-07-20 18:16:38]

Committed patchset #2 manually as r178529 (presubmit successful).