Fixed a leak and incorrect copy of C string. Added nsXPIDLCString::operator =() to simplify usage.

profile/src/nsProfile.cpp

@@ -591,7 +591,8 @@ NS_IMETHODIMP nsProfile::GetProfileDir(const char *profileName, nsFileSpec* prof
 
 						PR_FREEIF(encodedProfileDir);
 						
-						orgProfileDir.Copy(profileDir->GetCString());
+						// nsXPIDLCString::operator =() now copies, and owns result.
+						orgProfileDir = profileDir->GetCString();
 
 						// Get the value of entry "migrated" to check the nature of the profile
 						m_reg->GetString( newKey, "migrated", &isMigrated);