Refactor YieldFor() to avoid code duplication among the ports.

Don't repeat the same code in all the ports, move it to the common base class
and add a new virtual DoYieldFor() for the really port-specific code.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76061 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/core/evtloop.h

@@ -42,8 +42,6 @@ public:
     // to it (can be called from non main thread)
     virtual void WakeUp();
 
-    virtual bool YieldFor(long eventsToProcess);
-
     bool ShouldProcessIdleEvents() const { return m_processIdleEvents ; }
     
 #if wxUSE_UIACTIONSIMULATOR
@@ -57,6 +55,8 @@ protected:
     // terminating when Exit() is called
     virtual int DoRun();
 
+    virtual void DoYieldFor(long eventsToProcess);
+
     void CommonModeObserverCallBack(CFRunLoopObserverRef observer, int activity);
     void DefaultModeObserverCallBack(CFRunLoopObserverRef observer, int activity);