Ensure that bot_update points git solutions at the correct cache.
Ensure that bot_update points git solutions at the correct cache.

This ensures that, if a top-level solution changes URLs but
keeps the same name, the remote url is appropriately updated
to point at the correct git-cache directory.

TBR=hinoka@chromium.org, machenbach@chromium.org
BUG=411835

Review URL: https://codereview.chromium.org/598983003

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@292111 0039d316-1c4b-4281-b951-d872f2087c98

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