[update_engine] Update to use not-hideously-old logging API from chrome

BUG=None
TEST=compile

Change-Id: Ieed8952b6806a72b59e16c1579f7293b6a98157a

Review URL: http://codereview.chromium.org/3170010
diff --git a/test_http_server.cc b/test_http_server.cc
index 3f6897c..3c2ee54 100644
--- a/test_http_server.cc
+++ b/test_http_server.cc
@@ -22,7 +22,7 @@
 #include <algorithm>
 #include <string>
 #include <vector>
-#include "chromeos/obsolete_logging.h"
+#include "base/logging.h"
 
 using std::min;
 using std::string;