[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/omaha_hash_calculator.cc b/omaha_hash_calculator.cc
index 93b3d9e..7f62622 100644
--- a/omaha_hash_calculator.cc
+++ b/omaha_hash_calculator.cc
@@ -5,7 +5,7 @@
 #include <openssl/bio.h>
 #include <openssl/buffer.h>
 #include <openssl/evp.h>
-#include "chromeos/obsolete_logging.h"
+#include "base/logging.h"
 #include "update_engine/omaha_hash_calculator.h"
 
 namespace chromeos_update_engine {