WebView: Add channel info for UMA

components/version_info/version_info.h

Index: components/version_info/version_info.h
diff --git a/components/version_info/version_info.h b/components/version_info/version_info.h
index 62125412b65a363dcc26be9387a3d31907e19867..f25fc5ce52e0c6343323f10aa60796a88a0514f6 100644
--- a/components/version_info/version_info.h
+++ b/components/version_info/version_info.h
@@ -36,12 +36,6 @@ std::string GetOSType();
 // 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_