add cancel method to mailbox and pop protocol r=mscott

mailnews/local/src/nsMailboxProtocol.cpp

@@ -178,6 +178,13 @@ NS_IMETHODIMP nsMailboxProtocol::OnStopRequest(nsIChannel * aChannel, nsISupport
 // End of nsIStreamListenerSupport
 //////////////////////////////////////////////////////////////////////////////////////////////
 
+NS_IMETHODIMP nsMailboxProtocol::Cancel()  // handle stop button
+{
+	return nsMsgProtocol::Cancel();
+}
+
+
+
 PRInt32 nsMailboxProtocol::DoneReadingMessage()
 {
 	nsresult rv = NS_OK;

mailnews/local/src/nsMailboxProtocol.h

@@ -83,6 +83,7 @@ public:
 	////////////////////////////////////////////////////////////////////////////////////////
 	// End of nsIStreamListenerSupport
 	////////////////////////////////////////////////////////////////////////////////////////
+	NS_IMETHOD Cancel();  // handle stop button
 
 private:
 	nsCOMPtr<nsIMailboxUrl>	m_runningUrl; // the nsIMailboxURL that is currently running

mailnews/local/src/nsPop3Protocol.cpp

@@ -510,6 +510,12 @@ nsresult nsPop3Protocol::GetPassword(char ** aPassword)
 	return rv;
 }
 
+NS_IMETHODIMP nsPop3Protocol::Cancel()  // handle stop button
+{
+	return nsMsgProtocol::Cancel();
+}
+
+
 nsresult nsPop3Protocol::LoadUrl(nsIURI* aURL, nsISupports * /* aConsumer */)
 {
 	nsresult rv = 0;

mailnews/local/src/nsPop3Protocol.h

@@ -242,6 +242,8 @@ public:
 
     nsresult GetPassword(char ** aPassword);
 
+	NS_IMETHOD Cancel();  // handle stop button
+
 private:
 
     nsCString m_username;