Change the fake repo svn users to be emails.

Change the fake repo svn users to be emails.

Also remove the harcoding of the names by putting them in a variable.

This will help testing of the commit queue.

BUG=none
TEST=none

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=72454

[M-A Ruel, 2011-01-25 02:14:46]

I need to have the usernames be email addresses to mimic chromium's svn
repositories to be able to figure out a way to fix issues I've been facing with
http://codereview.chromium.org/6287009. I need to improve the unit tests in the
commit queue to iron the problem out.

[Dirk Pranke, 2011-01-25 02:20:27]

LGTM.