fix warning.

extensions/psm-glue/src/nsSSLIOLayer.cpp

@@ -40,7 +40,7 @@ class nsPSMSocketInfo : public nsIPSMSocketInfo
 {
 public:
     nsPSMSocketInfo();
-    ~nsPSMSocketInfo();
+    virtual ~nsPSMSocketInfo();
 
     NS_DECL_ISUPPORTS
     NS_DECL_NSIPSMSOCKETINFO

layout/build/nsLayoutDLF.cpp

@@ -122,7 +122,7 @@ class nsLayoutDLF : public nsIDocumentLoaderFactory,
 {
 public:
   nsLayoutDLF();
-  ~nsLayoutDLF();
+  virtual ~nsLayoutDLF();
 
   NS_DECL_ISUPPORTS