mac_tool: Alphabetize Exec functions, with their private methods below them.
mac_tool: Alphabetize Exec functions, with their private methods below them.

No behavior change.

TBR=evan
Review URL: https://chromiumcodereview.appspot.com/9374032

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@1193 78cadc50-ecff-11dd-a971-7dbc132099af

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