Remove chrome_git from external bot_update.
Remove chrome_git from external bot_update.

Also fix minor formatting.

R=hinoka@chromium.org
BUG=261741

Review URL: https://codereview.chromium.org/293363012

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@273047 0039d316-1c4b-4281-b951-d872f2087c98

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