[net/http auth] Make HttpAuthHandler challenge handling asynchronous.

net/http/http_auth_handler_negotiate.cc

Index: net/http/http_auth_handler_negotiate.cc
diff --git a/net/http/http_auth_handler_negotiate.cc b/net/http/http_auth_handler_negotiate.cc
index a183238faf4420704070ed66aa0bff57c7bbaecf..a0fa2dc725ca9533dd676c4a5ff005ee027151ff 100644
--- a/net/http/http_auth_handler_negotiate.cc
+++ b/net/http/http_auth_handler_negotiate.cc
@@ -42,7 +42,6 @@ void HttpAuthHandlerNegotiate::Factory::set_host_resolver(
 scoped_ptr<HttpAuthHandler>
 HttpAuthHandlerNegotiate::Factory::CreateAndInitPreemptiveAuthHandler(
     HttpAuthCache::Entry* cache_entry,
-    const HttpAuthChallengeTokenizer& tokenizer,
     HttpAuth::Target target,
     const BoundNetLog& net_log) {
   return scoped_ptr<HttpAuthHandler>();
@@ -195,8 +194,10 @@ bool HttpAuthHandlerNegotiate::AllowsExplicitCredentials() {
 
 // The Negotiate challenge header looks like:
 //   WWW-Authenticate: NEGOTIATE auth-data
-int HttpAuthHandlerNegotiate::Init(
-    const HttpAuthChallengeTokenizer& challenge) {
+int HttpAuthHandlerNegotiate::InitializeFromChallengeInternal(
+    const HttpAuthChallengeTokenizer& challenge,
+    const HttpResponseInfo& response_with_challenge,
+    const CompletionCallback& callback) {
 #if defined(OS_POSIX)
   if (!auth_system_.Init()) {
     VLOG(1) << "can't initialize GSSAPI library";
@@ -219,6 +220,12 @@ int HttpAuthHandlerNegotiate::Init(
              : ERR_INVALID_RESPONSE;
 }
 
+int HttpAuthHandlerNegotiate::InitializeFromCacheEntryInternal(
+    HttpAuthCache::Entry*) {
+  NOTREACHED();
+  return ERR_UNSUPPORTED_AUTH_SCHEME;
+}
+
 int HttpAuthHandlerNegotiate::GenerateAuthTokenImpl(
     const AuthCredentials* credentials,
     const HttpRequestInfo& request,