Refactor UKM interface for mojo-ification

components/ukm/ukm_entry_builder.cc

-// Copyright 2017 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/ukm/ukm_entry_builder.h"
-
-#include "base/metrics/metrics_hashes.h"
-#include "components/ukm/ukm_entry.h"
-#include "components/ukm/ukm_service.h"
-
-namespace ukm {
-
-UkmEntryBuilder::UkmEntryBuilder(const UkmService::AddEntryCallback& callback,
-                                 int32_t source_id,
-                                 const char* event_name)
-    : add_entry_callback_(callback),
-      entry_(new UkmEntry(source_id, event_name)) {}
-
-UkmEntryBuilder::~UkmEntryBuilder() {
-  add_entry_callback_.Run(std::move(entry_));
-}
-
-void UkmEntryBuilder::AddMetric(const char* metric_name, int64_t value) {
-  entry_->metrics_.emplace_back(
-      std::make_pair(base::HashMetricName(metric_name), value));
-}
-
-}  // namespace ukm