Revert of Convert startup_metric_utils to use mojo.

components/startup_metric_utils/browser/startup_metric_host_impl.h

Index: components/startup_metric_utils/browser/startup_metric_host_impl.h
diff --git a/components/startup_metric_utils/browser/startup_metric_host_impl.h b/components/startup_metric_utils/browser/startup_metric_host_impl.h
deleted file mode 100644
index cf903f37139b3e8880744f0ee677888445330d8b..0000000000000000000000000000000000000000
--- a/components/startup_metric_utils/browser/startup_metric_host_impl.h
+++ /dev/null
@@ -1,35 +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.
-
-#ifndef COMPONENTS_STARTUP_METRIC_UTILS_BROWSER_STARTUP_METRIC_HOST_IMPL_H_
-#define COMPONENTS_STARTUP_METRIC_UTILS_BROWSER_STARTUP_METRIC_HOST_IMPL_H_
-
-#include <stdint.h>
-
-#include "base/macros.h"
-#include "base/time/time.h"
-#include "components/startup_metric_utils/common/startup_metric.mojom.h"
-#include "mojo/public/cpp/bindings/strong_binding.h"
-
-namespace startup_metric_utils {
-
-class StartupMetricHostImpl : public mojom::StartupMetricHost {
- public:
-  static void Create(mojom::StartupMetricHostRequest request);
-
- private:
-  explicit StartupMetricHostImpl(mojom::StartupMetricHostRequest request);
-  ~StartupMetricHostImpl() override;
-
-  void RecordRendererMainEntryTime(
-      const base::TimeTicks& renderer_main_entry_time) override;
-
-  mojo::StrongBinding<mojom::StartupMetricHost> binding_;
-
-  DISALLOW_COPY_AND_ASSIGN(StartupMetricHostImpl);
-};
-
-}  // namespace startup_metric_utils
-
-#endif  // COMPONENTS_STARTUP_METRIC_UTILS_BROWSER_STARTUP_METRIC_HOST_IMPL_H_