Adds support for the DHCP portion of the WPAD (proxy auto-discovery) protocol.

net/proxy/dhcp_proxy_script_fetcher.cc

Index: net/proxy/dhcp_proxy_script_fetcher.cc
diff --git a/net/proxy/dhcp_proxy_script_fetcher.cc b/net/proxy/dhcp_proxy_script_fetcher.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d74e3433daafe04980037040667bcd2c60cefe12
--- /dev/null
+++ b/net/proxy/dhcp_proxy_script_fetcher.cc
@@ -0,0 +1,44 @@
+// Copyright (c) 2011 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.
+
+#include "net/proxy/dhcp_proxy_script_fetcher.h"
+
+#include "net/base/net_errors.h"
+
+namespace net {
+
+DhcpProxyScriptFetcher::DhcpProxyScriptFetcher() {
+}
+
+DhcpProxyScriptFetcher::~DhcpProxyScriptFetcher() {
+}
+
+std::string DhcpProxyScriptFetcher::GetFetcherName() const {
+  return "";
+}
+
+DoNothingDhcpProxyScriptFetcher::DoNothingDhcpProxyScriptFetcher() {
+}
+
+DoNothingDhcpProxyScriptFetcher::~DoNothingDhcpProxyScriptFetcher() {
+}
+
+int DoNothingDhcpProxyScriptFetcher::Fetch(string16* utf16_text,
+                                           CompletionCallback* callback) {
+  *utf16_text = string16();
+  return ERR_NOT_IMPLEMENTED;
+}
+
+void DoNothingDhcpProxyScriptFetcher::Cancel() {
+}
+
+URLRequestContext* DoNothingDhcpProxyScriptFetcher::GetRequestContext() const {
+  return NULL;
+}
+
+GURL DoNothingDhcpProxyScriptFetcher::GetPacURL() const {
+  return GURL();
+}
+
+}  // namespace net