* This fixes _determineIfOwner so that the check inside it "access && !!access[repo].is_owner"
forces a boolean value.
* This fixes a issue where you change the head to point to a different branch,
but it did not correctly update the delete branch button, without needing
to refresh the page.
Bug: Issue 10151
Bug: Issue 10019
Change-Id: I8a500a02865d88986b710e552b0c6d81576e301f