Convert startup_metric_utils to use mojo.

components/startup_metric_utils/browser/startup_metric_message_filter.cc

Index: components/startup_metric_utils/browser/startup_metric_message_filter.cc
diff --git a/components/startup_metric_utils/browser/startup_metric_message_filter.cc b/components/startup_metric_utils/browser/startup_metric_message_filter.cc
deleted file mode 100644
index 556d045e023f5a18101d253f52b61c547a81f45b..0000000000000000000000000000000000000000
--- a/components/startup_metric_utils/browser/startup_metric_message_filter.cc
+++ /dev/null
@@ -1,31 +0,0 @@
-// Copyright 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.
-
-#include "components/startup_metric_utils/browser/startup_metric_message_filter.h"
-
-#include "components/startup_metric_utils/browser/startup_metric_utils.h"
-#include "components/startup_metric_utils/common/startup_metric_messages.h"
-
-namespace startup_metric_utils {
-
-StartupMetricMessageFilter::StartupMetricMessageFilter()
-    : content::BrowserMessageFilter(StartupMetricMsgStart) {}
-
-bool StartupMetricMessageFilter::OnMessageReceived(
-    const IPC::Message& message) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(StartupMetricMessageFilter, message)
-    IPC_MESSAGE_HANDLER(StartupMetricHostMsg_RecordRendererMainEntryTime,
-                        OnRecordRendererMainEntryTime)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-  return handled;
-}
-
-void StartupMetricMessageFilter::OnRecordRendererMainEntryTime(
-    const base::TimeTicks& renderer_main_entry_time) {
-  RecordRendererMainEntryTime(renderer_main_entry_time);
-}
-
-}  // namespace startup_metric_utils