Move HashMetricName to base namespace.

components/metrics/metrics_hashes_unittest.cc

-// Copyright 2014 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.
-
-#include "components/metrics/metrics_hashes.h"
-
-#include "base/format_macros.h"
-#include "base/strings/stringprintf.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace metrics {
-
-// Make sure our ID hashes are the same as what we see on the server side.
-TEST(MetricsUtilTest, HashMetricName) {
-  static const struct {
-    std::string input;
-    std::string output;
-  } cases[] = {
-    {"Back", "0x0557fa923dcee4d0"},
-    {"Forward", "0x67d2f6740a8eaebf"},
-    {"NewTab", "0x290eb683f96572f1"},
-  };
-
-  for (size_t i = 0; i < arraysize(cases); ++i) {
-    uint64 hash = HashMetricName(cases[i].input);
-    std::string hash_hex = base::StringPrintf("0x%016" PRIx64, hash);
-    EXPECT_EQ(cases[i].output, hash_hex);
-  }
-}
-
-}  // namespace metrics