Update lkgr_finder.py based on latest changes.
Update lkgr_finder.py based on latest changes.

- Increase the urllib timeout from 60 to 600s.
- Add commented out check for check_deps, need to switch soon.
- Convert an assert ot a raise with more info.

BUG=119206
TBR=thestig@chromium.org


Review URL: http://codereview.chromium.org/9853034

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@128968 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build