Reason for revert:
Separating change into smaller changes.

Original issue's description:
> Bot update cleanup
> 
> * Remove activation check
> * Remove messages
> * Remove deps2git
> * Remove build_internal pointer by:
> ** Moving chrome svn url into bot_update.py (This isn't secret anyways.)
> ** Move patch.exe into depot_tools (No reason this should've been internal...)
> ** Default everything to active, so no need for checks anyways.
> 
> BUG=
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=298809

TBR=martiniss@chromium.org,eseidel@chromium.org,estaab@chromium.org,iannucci@chromium.org,hinoka@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=

Review URL: https://codereview.chromium.org/1706893003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@298826 0039d316-1c4b-4281-b951-d872f2087c98