Update from https://crrev.com/327068

base/metrics/BUILD.gn

 # Copyright (c) 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 source_set("metrics") {
   sources = [
     "bucket_ranges.cc",
     "bucket_ranges.h",
     "field_trial.cc",
     "field_trial.h",
     "histogram.cc",
     "histogram.h",
     "histogram_base.cc",
     "histogram_base.h",
-    "histogram_delta_serialization.",
     "histogram_delta_serialization.cc",
+    "histogram_delta_serialization.h",
     "histogram_flattener.h",
     "histogram_macros.h",
     "histogram_samples.cc",
     "histogram_samples.h",
     "histogram_snapshot_manager.cc",
     "histogram_snapshot_manager.h",
     "sample_map.cc",
     "sample_map.h",
     "sample_vector.cc",
     "sample_vector.h",
@@ skipping 13 matching lines @@
   configs += [ "//base:base_implementation" ]
 
   deps = [
     "//base/debug",
     "//base/json",
     "//base/memory",
   ]
 
   visibility = [ "//base/*" ]
 }