Change base/file_utils.h includes to base/files/file_utils.h in chrome/

Review URL: https://codereview.chromium.org/486843004

Cr-Commit-Position: refs/heads/master@{#291880}
diff --git a/chrome/common/extensions/manifest_url_handler.cc b/chrome/common/extensions/manifest_url_handler.cc
index be0bea5..6aef2ce 100644
--- a/chrome/common/extensions/manifest_url_handler.cc
+++ b/chrome/common/extensions/manifest_url_handler.cc
@@ -4,7 +4,7 @@
 
 #include "chrome/common/extensions/manifest_url_handler.h"
 
-#include "base/file_util.h"
+#include "base/files/file_util.h"
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_util.h"