Grab bag of clang fixes for Windows code

net/http/http_auth_sspi_win.cc

 // 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.
 
 // See "SSPI Sample Application" at
 // http://msdn.microsoft.com/en-us/library/aa918273.aspx
 
 #include "net/http/http_auth_sspi_win.h"
 
 #include "base/base64.h"
@@ skipping 168 matching lines @@
           << "FreeContextBuffer returned undocumented status 0x"
           << std::hex << status;
       return ERR_UNDOCUMENTED_SECURITY_LIBRARY_STATUS;
   }
 }
 
 }  // anonymous namespace
 
 HttpAuthSSPI::HttpAuthSSPI(SSPILibrary* library,
                            const std::string& scheme,
-                           SEC_WCHAR* security_package,
+                           const SEC_WCHAR* security_package,
                            ULONG max_token_length)
     : library_(library),
       scheme_(scheme),
       security_package_(security_package),
       max_token_length_(max_token_length),
       can_delegate_(false) {
   DCHECK(library_);
   SecInvalidateHandle(&cred_);
   SecInvalidateHandle(&ctxt_);
 }
@@ skipping 220 matching lines @@
   int token_length = pkg_info->cbMaxToken;
   status = library->FreeContextBuffer(pkg_info);
   rv = MapFreeContextBufferStatusToError(status);
   if (rv != OK)
     return rv;
   *max_token_length = token_length;
   return OK;
 }
 
 }  // namespace net