Added wxInfoBar::Dismiss().

Add a method to conveniently hide the info bar and update the parent layout.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62284 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/infobar.h

@@ -36,6 +36,9 @@ public:
     virtual void ShowMessage(const wxString& msg,
                              int flags = wxICON_INFORMATION) = 0;
 
+    // hide the info bar
+    virtual void Dismiss() = 0;
+
     // add an extra button to the bar, near the message (replacing the default
     // close button which is only shown if no extra buttons are used)
     virtual void AddButton(wxWindowID btnid,