fix the XPCOM out-param memory ownership issue of bug 60304 "Basic Auth

doesn't work for Java"
patch = joshua.xia; r = jst; sr = darin

modules/oji/public/nsIJVMAuthTools.idl

@@ -34,6 +34,7 @@
 
 %}
 
+[ptr] native const_char_ptr(const char);
 
 [noscript, uuid(078a1b99-6be2-4a57-a749-378f4a506097)]
 interface nsIAuthenticationInfo : nsISupports
@@ -42,8 +43,8 @@ interface nsIAuthenticationInfo : nsISupports
     * AuthenticationInfo (username/password pair)
     */
 
-   readonly attribute string  username;
-   readonly attribute string  password;
+   readonly attribute const_char_ptr  username;
+   readonly attribute const_char_ptr  password;
 };
 
 [noscript, uuid(82274a32-a196-42ee-8e3b-fcb73e339518)]

modules/oji/src/nsJVMAuthTools.cpp

@@ -66,14 +66,14 @@ nsAuthenticationInfoImp::~nsAuthenticationInfoImp()
 }
 
 /* readonly attribute string username; */
-NS_IMETHODIMP nsAuthenticationInfoImp::GetUsername(char * *aUsername)
+NS_IMETHODIMP nsAuthenticationInfoImp::GetUsername(const char * *aUsername)
 {
     *aUsername = mUserName;
     return NS_OK;
 }
 
 /* readonly attribute string password; */
-NS_IMETHODIMP nsAuthenticationInfoImp::GetPassword(char * *aPassword)
+NS_IMETHODIMP nsAuthenticationInfoImp::GetPassword(const char * *aPassword)
 {
     *aPassword = mPassWord;
     return NS_OK;