Support specifying the GSSAPI library that will be used.

net/http/http_auth_handler_negotiate.h

Index: net/http/http_auth_handler_negotiate.h
diff --git a/net/http/http_auth_handler_negotiate.h b/net/http/http_auth_handler_negotiate.h
index 5f46ab18e718eb873e401cd064054c4f087e1f19..e6679ded920cd738c152415c68872b0f42ddce24 100644
--- a/net/http/http_auth_handler_negotiate.h
+++ b/net/http/http_auth_handler_negotiate.h
@@ -72,14 +72,12 @@ class HttpAuthHandlerNegotiate : public HttpAuthHandler {
                                   const BoundNetLog& net_log,
                                   scoped_ptr<HttpAuthHandler>* handler);
 
-    // Set the system library to use. Typically the only callers which need to
-    // use this are unit tests which pass in a mocked-out version of the
-    // system library.
-    // The caller is responsible for managing the lifetime of |*auth_library|,
-    // and the lifetime must exceed that of this Factory object and all
-    // HttpAuthHandler's that this Factory object creates.
+    // Set the system library to use. Typically used by unit tests which mock
+    // out the library, and on POSIX to pass a user-specified library.
+    // Callers beware: the passed |*auth_library| will be deleted when this
+    // factory is destructed.
     void set_library(AuthLibrary* auth_library) {
-      auth_library_ = auth_library;
+      auth_library_.reset(auth_library);

[cbentzel, 2010/11/09 16:18:03]

This is still doing the wrong thing in the Windows case - it will cause a double
delete of the default SSPI library if it is ever set (since the SSPI library is
a singleton which also deletes the lone instance.)

I recommend one of two ways to fix this:
  - Make it so the default library is not a singleton, and have it be owned by
the factory.
  - Change the code back to the way it was, and hold onto the GSSAPI library in
the IOThread::Globals

[Jakob Kummerow (corp), 2010/11/10 10:50:21]

Done.
I went with the first suggestion, as I consider it more elegant to have
ownership of the library at the same place where it's used. 

     }
 
    private:
@@ -91,7 +89,7 @@ class HttpAuthHandlerNegotiate : public HttpAuthHandler {
     bool first_creation_;
     bool is_unsupported_;
 #endif
-    AuthLibrary* auth_library_;
+    scoped_ptr<AuthLibrary> auth_library_;
   };
 
   HttpAuthHandlerNegotiate(AuthLibrary* sspi_library,