[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/generate_delta_main.cc b/generate_delta_main.cc
index 32b3923..7e18252 100644
--- a/generate_delta_main.cc
+++ b/generate_delta_main.cc
@@ -13,7 +13,7 @@
 #include <gflags/gflags.h>
 #include <glib.h>
 #include "base/command_line.h"
-#include "chromeos/obsolete_logging.h"
+#include "base/logging.h"
 #include "update_engine/delta_diff_generator.h"
 #include "update_engine/delta_performer.h"
 #include "update_engine/subprocess.h"