Adapt to changes in prefapi.h etc

mailnews/db/msgdb/src/nsMsgDatabase.cpp

@@ -2242,7 +2242,7 @@ PRBool	nsMsgDatabase::ThreadBySubjectWithoutRe()
 
 nsresult nsMsgDatabase::GetBoolPref(const char *prefName, PRBool *result)
 {
-	XP_Bool prefValue = PR_FALSE;
+	PRBool prefValue = PR_FALSE;
 	nsIPref* prefs = nsnull;
 	nsresult rv;
 	rv = nsServiceManager::GetService(kPrefCID, kIPrefIID, (nsISupports**)&prefs);
@@ -2251,7 +2251,7 @@ nsresult nsMsgDatabase::GetBoolPref(const char *prefName, PRBool *result)
 //		prefs->Startup("prefs.js");
 
 		rv = prefs->GetBoolPref(prefName, &prefValue);
-		*result = (PRBool) prefValue;
+		*result = prefValue;
 		nsServiceManager::ReleaseService(kPrefCID, prefs);
 	}
 	return rv;