WebView: Add channel info for UMA

components/metrics/net/version_utils.h

-// 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_METRICS_NET_VERSION_UTILS_H_
-#define COMPONENTS_METRICS_NET_VERSION_UTILS_H_
-
-#include <string>
-
-#include "components/metrics/proto/system_profile.pb.h"
-
-namespace version_info {
-enum class Channel;
-}
-
-namespace metrics {
-
-// Build a string including the Chrome app version, suffixed by "-64" on 64-bit
-// platforms, and "-devel" on developer builds.
-std::string GetVersionString();
-
-// Translates version_info::Channel to the equivalent
-// SystemProfileProto::Channel.
-SystemProfileProto::Channel AsProtobufChannel(
-    version_info::Channel channel);
-
-}  // namespace metrics
-
-#endif  // COMPONENTS_METRICS_NET_VERSION_UTILS_H_