update_engine: Include base/macros.h instead of base/basictypes.h

update_engine no longer uses the integer types from base/basictypes.h.
It should simply include base/macros.h for the DISALLOW_COPY_AND_ASSIGN
macro instead.

BUG=None
TEST=`FEATURES=test emerge-$BOARD update_engine`

Change-Id: Idf18bc69339b7170122b289342c724c862454062
Reviewed-on: https://chromium-review.googlesource.com/216140
Tested-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Alex Deymo <deymo@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
diff --git a/prefs_unittest.cc b/prefs_unittest.cc
index fa66bfd..6ff3945 100644
--- a/prefs_unittest.cc
+++ b/prefs_unittest.cc
@@ -6,11 +6,12 @@
 
 #include <string>
 
-#include "base/basictypes.h"
-#include "base/file_util.h"
+#include <base/file_util.h>
+#include <base/macros.h>
 #include <base/strings/string_util.h>
 #include <base/strings/stringprintf.h>
-#include "gtest/gtest.h"
+#include <gtest/gtest.h>
+
 #include "update_engine/prefs.h"
 
 using std::string;