[cr tool] Renaming cr.sh to cr-bash-helpers.sh

BUG=327039

Review URL: https://codereview.chromium.org/103943008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240109 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240109