WebView: Add channel info for UMA

components/version_info/version_info.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_VERSION_INFO_VERSION_INFO_H_
 #define COMPONENTS_VERSION_INFO_VERSION_INFO_H_
 
 #include <string>
 
 #include "components/version_info/channel.h"
@@ skipping 18 matching lines @@
 // GetLastChange() is.
 bool IsOfficialBuild();
 
 // Returns the OS type, e.g. "Windows", "Linux", "FreeBDS", ...
 std::string GetOSType();
 
 // Returns a string equivalent of |channel|, indenpendent of whether the build
 // is branded or not and without any additional modifiers.
 std::string GetChannelString(Channel channel);
 
-// Returns a version string to be displayed in "About Chromium" dialog.
-// |modifier| is a string representation of the channel with system specific
-// information, e.g. "dev SyzyASan". It is appended to the returned version
-// information if non-empty.
-std::string GetVersionStringWithModifier(const std::string& modifier);
-
 }  // namespace version_info
 
 #endif  // COMPONENTS_VERSION_INFO_VERSION_INFO_H_