Explicitly pass "--diff-cmd diff" to "svn diff", for users who have set some other diff tool.

Review URL: https://chromiumcodereview.appspot.com/14130006

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@194740 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed