Make build-bisect script work on win.
Make build-bisect script work on win.

Unzip using python rather than using the unzip command which might not be
available on windows.

TEST=NONE
BUG=NONE

Review URL: http://codereview.chromium.org/1549006

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@43160 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser