Migrate Proxy Settings API to net::ProxyServer

net/proxy/proxy_server.h

Index: net/proxy/proxy_server.h
diff --git a/net/proxy/proxy_server.h b/net/proxy/proxy_server.h
index 3786ddbe0a755f5790f53920a5437fd9a9f34e2c..316725243ba1bffc7de9945a5e6a5ea4fc572e19 100644
--- a/net/proxy/proxy_server.h
+++ b/net/proxy/proxy_server.h
@@ -128,6 +128,12 @@ class ProxyServer {
   // scheme. Returns -1 if unknown.
   static int GetDefaultPortForScheme(Scheme scheme);
 
+  // Parses the proxy scheme from a URL-like representation, to a
+  // ProxyServer::Scheme. This corresponds with the values used in
+  // ProxyServer::ToURI(). If no type could be matched, returns SCHEME_INVALID.
+  // |scheme| can be one of http, https, socks, socks4, socks5, direct.
+  static Scheme GetSchemeFromURI(const std::string& scheme);
+
   bool operator==(const ProxyServer& other) const {
     return scheme_ == other.scheme_ &&
            host_port_pair_.Equals(other.host_port_pair_);