Use a direct include of the message_loop header in cc/, chrome_frame/, cloud_print/, components.

cc/test/run_all_unittests.cc

Index: cc/test/run_all_unittests.cc
diff --git a/cc/test/run_all_unittests.cc b/cc/test/run_all_unittests.cc
index b4ec0929743e71d0b351623570935cd23f586421..0ac740ea70618cfa0b486eba1658baf6385e6c62 100644
--- a/cc/test/run_all_unittests.cc
+++ b/cc/test/run_all_unittests.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/test/test_suite.h"
 #include "cc/test/cc_test_suite.h"
 #include "testing/gmock/include/gmock/gmock.h"