Unification of LoadUrl signature to remove some warnings on Linux & Mac. LoadUrl signature takes a display consumer

mailnews/local/src/nsPop3Protocol.cpp

@@ -473,7 +473,7 @@ void nsPop3Protocol::SetPassword(const char* passwd)
 }
 
 
-nsresult nsPop3Protocol::LoadUrl(nsIURL* aURL)
+nsresult nsPop3Protocol::LoadUrl(nsIURL* aURL, nsISupports * /* aConsumer */)
 {
 	const char* urlSpec = NULL;
 	const char* host = NULL;

mailnews/local/src/nsPop3Protocol.h

@@ -296,7 +296,7 @@ public:
     nsPop3Protocol(nsIURL* aURL);  
     virtual ~nsPop3Protocol();
     
-    virtual nsresult LoadUrl(nsIURL *aURL);
+    virtual nsresult LoadUrl(nsIURL *aURL, nsISupports * aConsumer = nsnull);
 
     const char* GetUsername() { return m_username; };
     void SetUsername(const char* name);