buffet: Remove unused include

buffet/utils.h is used instead of base/json/json_reader.h

BUG=none
TEST=`FEATURES=test emerge-gizmo buffet`

Change-Id: I1fb91223e3dc2a94437e0be2bb4ae09df03f94a6
Reviewed-on: https://chromium-review.googlesource.com/273339
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Trybot-Ready: Vitaly Buka <vitalybuka@chromium.org>
Tested-by: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>

buffet/storage_impls.cc

diff --git a/buffet/storage_impls.cc b/buffet/storage_impls.cc
index b0bcfd9..d030ecb 100644
--- a/buffet/storage_impls.cc
+++ b/buffet/storage_impls.cc
@@ -7,7 +7,6 @@
 #include <string>
 
 #include <base/files/important_file_writer.h>
-#include <base/json/json_reader.h>
 #include <base/json/json_writer.h>
 
 #include "buffet/utils.h"