Don't pump the message loop in DeleteWhileInProgress at all.

chrome/browser/net/connection_tester_unittest.cc

Index: chrome/browser/net/connection_tester_unittest.cc
diff --git a/chrome/browser/net/connection_tester_unittest.cc b/chrome/browser/net/connection_tester_unittest.cc
index cbdf156dcc09c2f5dc29f82ba4c4d258b4e6ed0b..961be6fba1969a5776edfe780fe76d1ce32c7ec8 100644
--- a/chrome/browser/net/connection_tester_unittest.cc
+++ b/chrome/browser/net/connection_tester_unittest.cc
@@ -176,7 +176,9 @@ TEST_F(ConnectionTesterTest, DeleteWhileInProgress) {
   // TODO(eroman): Is this URL right?
   tester->RunAllTests(test_server_.GetURL("echoall"));
 
-  MessageLoop::current()->RunAllPending();
+  // Don't run the message loop at all.  Otherwise the experiment's request may
+  // complete and post a task to run the next experiment before we quit the
+  // message loop.
 
   EXPECT_EQ(1, test_delegate_.start_connection_test_suite_count());
   EXPECT_EQ(1, test_delegate_.start_connection_test_experiment_count());