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

net/http/http_network_transaction.h

Index: net/http/http_network_transaction.h
diff --git a/net/http/http_network_transaction.h b/net/http/http_network_transaction.h
index a5e5b08032353f7189b89ba61ee5c78ce2b65408..8760eb248ce4dfb7d30d63f3b62f6e96c89d9f9b 100644
--- a/net/http/http_network_transaction.h
+++ b/net/http/http_network_transaction.h
@@ -145,6 +145,8 @@ class NET_EXPORT_PRIVATE HttpNetworkTransaction
     STATE_SEND_REQUEST_COMPLETE,
     STATE_READ_HEADERS,
     STATE_READ_HEADERS_COMPLETE,
+    STATE_HANDLE_AUTH_CHALLENGE,
+    STATE_HANDLE_AUTH_CHALLENGE_COMPLETE,
     STATE_READ_BODY,
     STATE_READ_BODY_COMPLETE,
     STATE_DRAIN_BODY_FOR_AUTH_RESTART,
@@ -185,6 +187,8 @@ class NET_EXPORT_PRIVATE HttpNetworkTransaction
   int DoSendRequestComplete(int result);
   int DoReadHeaders();
   int DoReadHeadersComplete(int result);
+  int DoHandleAuthChallenge();
+  int DoHandleAuthChallengeComplete(int result);
   int DoReadBody();
   int DoReadBodyComplete(int result);
   int DoDrainBodyForAuthRestart();
@@ -251,11 +255,6 @@ class NET_EXPORT_PRIVATE HttpNetworkTransaction
   // Returns true if we should try to add an Authorization header.
   bool ShouldApplyServerAuth() const;
 
-  // Handles HTTP status code 401 or 407.
-  // HandleAuthChallenge() returns a network error code, or OK on success.
-  // May update |pending_auth_target_| or |response_.auth_challenge|.
-  int HandleAuthChallenge();
-
   // Returns true if we have auth credentials for the given target.
   bool HaveAuth(HttpAuth::Target target) const;