[net/auth] Discard current handler token generation fails.

net/http/http_auth_handler_mock.h

Index: net/http/http_auth_handler_mock.h
diff --git a/net/http/http_auth_handler_mock.h b/net/http/http_auth_handler_mock.h
index 049b880354038f0fe46e73727b5ea700a947edd9..d8e3e456f9d409b57ebdacae865ff23a504e8a49 100644
--- a/net/http/http_auth_handler_mock.h
+++ b/net/http/http_auth_handler_mock.h
@@ -6,6 +6,7 @@
 #define NET_HTTP_HTTP_AUTH_HANDLER_MOCK_H_
 
 #include <memory>
+#include <ostream>
 #include <string>
 #include <vector>
 
@@ -21,6 +22,14 @@ class HostResolver;
 // MockAuthHandler is used in tests to reliably trigger edge cases.
 class HttpAuthHandlerMock : public HttpAuthHandler {
  public:
+  enum class State {
+    WAIT_FOR_INIT,
+    WAIT_FOR_CHALLENGE,
+    WAIT_FOR_GENERATE_AUTH_TOKEN,
+    TOKEN_PENDING,
+    DONE
+  };
+
   enum Resolve {
     RESOLVE_INIT,
     RESOLVE_SKIP,
@@ -88,6 +97,8 @@ class HttpAuthHandlerMock : public HttpAuthHandler {
     return request_url_;
   }
 
+  const State state() const { return state_; }
+
   // HttpAuthHandler:
   HttpAuth::AuthorizationResult HandleAnotherChallenge(
       HttpAuthChallengeTokenizer* challenge) override;
@@ -109,6 +120,7 @@ class HttpAuthHandlerMock : public HttpAuthHandler {
 
   void OnGenerateAuthToken();
 
+  State state_;
   Resolve resolve_;
   CompletionCallback callback_;
   bool generate_async_;
@@ -122,6 +134,8 @@ class HttpAuthHandlerMock : public HttpAuthHandler {
   base::WeakPtrFactory<HttpAuthHandlerMock> weak_factory_;
 };
 
+void PrintTo(const HttpAuthHandlerMock::State& state, ::std::ostream* os);
+
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_AUTH_HANDLER_MOCK_H_