Add missing include

discard_metrics_util.cc should include discard_metrics_util.h.

Change-Id: I542f831ec61202d210c2aa854bfe7276df1f6f5a
Reviewed-on: https://chromium-review.googlesource.com/890305Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532419}

chrome/browser/resource_coordinator/discard_metrics_util.cc

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "chrome/browser/resource_coordinator/discard_metrics_util.h"
+
 #include "base/metrics/histogram_macros.h"
 
 namespace resource_coordinator {