Fix help and error messages.

I see a couple more to_build_path references and misprints but
it is getting late.

I am also not sure what to do with neologisms like "dependee" and
"uniquify".

BUG= none
TEST= none
R=brettw@chromium.org

Review URL: https://codereview.chromium.org/115323009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243038 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243038