Allow ProxyConfigService to report "no configuration set"

chrome/browser/net/resolve_proxy_msg_helper_unittest.cc

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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 "chrome/browser/net/resolve_proxy_msg_helper.h"
 
 #include "net/base/net_errors.h"
 #include "net/proxy/mock_proxy_resolver.h"
 #include "net/proxy/proxy_config_service.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 // This ProxyConfigService always returns "http://pac" as the PAC url to use.
 class MockProxyConfigService : public net::ProxyConfigService {
  public:
   virtual void AddObserver(Observer* observer) {}
   virtual void RemoveObserver(Observer* observer) {}
-  virtual bool GetLatestProxyConfig(net::ProxyConfig* results) {
+  virtual ConfigAvailability GetLatestProxyConfig(net::ProxyConfig* results) {
     *results = net::ProxyConfig::CreateFromCustomPacURL(GURL("http://pac"));
-    return true;
+    return CONFIG_VALID;
   }
 };
 
 class MyDelegate : public ResolveProxyMsgHelper::Delegate {
  public:
   struct PendingResult {
     PendingResult(IPC::Message* msg,
                   int error_code,
                   const std::string& proxy_list)
         : msg(msg), error_code(error_code), proxy_list(proxy_list) {
@@ skipping 194 matching lines @@
 
   // The pending requests sent to the proxy resolver should have been cancelled.
 
   EXPECT_EQ(0u, resolver->pending_requests().size());
 
   EXPECT_TRUE(delegate.pending_result() == NULL);
 
   // It should also be the case that msg1, msg2, msg3 were deleted by the
   // cancellation. (Else will show up as a leak in Purify/Valgrind).
 }