Add superficial unit test for PrintJob. That's a start.

base/thread.cc

Index: base/thread.cc
===================================================================
--- base/thread.cc	(revision 5486)
+++ base/thread.cc	(working copy)
@@ -131,9 +131,6 @@
   DCHECK(message_loop_);
 
   message_loop_->PostTask(FROM_HERE, new ThreadQuitTask());
-
-  // The thread can't receive messages anymore.

[brettw, 2008/11/14 22:05:08]

It's not clear why you made this change.

[M-A Ruel, 2008/11/15 02:26:01]

It's because it's doing this from the wrong thread. Only the actual thread
should modify message_loop_. This function is only used by PrintJob due to a
specific dead lock.

-  message_loop_ = NULL;
 }
 
 void Thread::ThreadMain() {