Use a direct include of the message_loop header in net/, part 2.

BUG=260807
TEST=none
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Review URL: https://chromiumcodereview.appspot.com/19625002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@212241 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/net/http/mock_http_cache.cc b/net/http/mock_http_cache.cc
index 8f2eb7c..3bbf91e 100644
--- a/net/http/mock_http_cache.cc
+++ b/net/http/mock_http_cache.cc
@@ -5,7 +5,7 @@
 #include "net/http/mock_http_cache.h"
 
 #include "base/bind.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_errors.h"
 #include "testing/gtest/include/gtest/gtest.h"