Revert portion of 286574 that strips out custom_deps
Revert portion of 286574 that strips out custom_deps

https://codereview.chromium.org/397373002/ has a broken portion of bot_update.
This CL reverts that portion

BUG=261741
TBR=agable

Review URL: https://codereview.chromium.org/429863007

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@286579 0039d316-1c4b-4281-b951-d872f2087c98

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