Use a direct include of the message_loop header in base/.

BUG=260807
TEST=none
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Review URL: https://chromiumcodereview.appspot.com/19224003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@212281 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/base/system_monitor/system_monitor.cc b/base/system_monitor/system_monitor.cc
index d11ffc0..11dd000 100644
--- a/base/system_monitor/system_monitor.cc
+++ b/base/system_monitor/system_monitor.cc
@@ -7,7 +7,7 @@
 #include <utility>
 
 #include "base/logging.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/time/time.h"
 
 namespace base {