update_engine: Update to build against libchrome-271506.

BUG=chromium:375032
TEST=`FEATURES=test emerge-$BOARD update_engine`

Change-Id: Ia7be302c12b439ad8aece51c9cbe128086626620
Reviewed-on: https://chromium-review.googlesource.com/201045
Tested-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Alex Deymo <deymo@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
diff --git a/policy_manager/real_random_provider.cc b/policy_manager/real_random_provider.cc
index d29590b..17706a9 100644
--- a/policy_manager/real_random_provider.cc
+++ b/policy_manager/real_random_provider.cc
@@ -6,7 +6,7 @@
 #include <unistd.h>
 
 #include <base/files/file_path.h>
-#include <base/file_util.h>
+#include <base/files/scoped_file.h>
 #include <base/strings/stringprintf.h>
 
 #include "update_engine/policy_manager/real_random_provider.h"
@@ -58,7 +58,7 @@
   }
 
  private:
-  file_util::ScopedFILE fp_;
+  base::ScopedFILE fp_;
 
   DISALLOW_COPY_AND_ASSIGN(RandomSeedVariable);
 };