Move HashMetricName to base namespace.

base/BUILD.gn

 # Copyright (c) 2013 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.
 
 import("//build/config/compiler/compiler.gni")
 import("//build/config/nacl/config.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
@@ skipping 1357 matching lines @@
     "message_loop/message_loop_unittest.cc",
     "message_loop/message_pump_glib_unittest.cc",
     "message_loop/message_pump_io_ios_unittest.cc",
     "metrics/bucket_ranges_unittest.cc",
     "metrics/field_trial_unittest.cc",
     "metrics/histogram_base_unittest.cc",
     "metrics/histogram_delta_serialization_unittest.cc",
     "metrics/histogram_macros_unittest.cc",
     "metrics/histogram_snapshot_manager_unittest.cc",
     "metrics/histogram_unittest.cc",
+    "metrics/metrics_hashes_unittest.cc",
     "metrics/sample_map_unittest.cc",
     "metrics/sample_vector_unittest.cc",
     "metrics/sparse_histogram_unittest.cc",
     "metrics/statistics_recorder_unittest.cc",
     "move_unittest.cc",
     "native_library_unittest.cc",
     "numerics/safe_numerics_unittest.cc",
     "observer_list_unittest.cc",
     "os_compat_android_unittest.cc",
     "path_service_unittest.cc",
@@ skipping 362 matching lines @@
 
   # GYP: //base.gyp:base_java_unittest_support
   android_library("base_java_unittest_support") {
     deps = [
       ":base_java",
     ]
     java_files =
         [ "test/android/java/src/org/chromium/base/ContentUriTestUtils.java" ]
   }
 }