Make the android_aosp trybots use bot_update.
Make the android_aosp trybots use bot_update.

The gclient revert step is now timing out making these bots fail.
Also the bots on the master waterfall use the bot_update script
so this should improve consistency.

BUG=383292, 361346

Review URL: https://codereview.chromium.org/323343002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@276381 0039d316-1c4b-4281-b951-d872f2087c98

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