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This matches how most of our other build steps work, so is good just for improving
consistency between build steps. It should also make it possible for
ExtractTestResultsAndLeaks to successfully add a URL to Leaks Viewer. (Previously we were
trying to do this in finished() after we had called up to the base class, but that was
apparently too late to add more URLs.)

Hopefully fixes <http://webkit.org/b/56032> Leaks viewer should be linked from leaks bot
results page

Reviewed by John Sullivan.

* BuildSlaveSupport/build.webkit.org-config/master.cfg:
(ExtractTestResults): Added a descriptionDone property so that we don't have to manually
call setText to get the right text to show up for this step. This matches how most of our
other build steps work.
(ExtractTestResults.commandComplete): Replaced our override of finished with this function.
This is how most of our other build steps work.
(ExtractTestResultsAndLeaks.commandComplete): Replaced our override of finished with this
function, to match the base class.

git-svn-id: svn://svn.chromium.org/blink/trunk@83168 bbb929c8-8fbe-4397-9dbb-9b2b20218538