Increase the timeout for the update_scripts steps.
Increase the timeout for the update_scripts steps.

60 seconds is not enough for some extreme conditions, and has caused a lot
of failures in the past. For example:
- Adding git to depot_tools.  We can't download git in less than 60 seconds
- SVN server slowdown
- Lots of changes in the buildbot scripts (adding new buildbot versions, etc)
- Some of our machines are really slow.

The new timeout is 5 minutes.

Review URL: http://codereview.chromium.org/10167018

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@133354 0039d316-1c4b-4281-b951-d872f2087c98

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