Remove isCompositorFramePending plumbing

public/web/WebWidgetClient.h

Index: public/web/WebWidgetClient.h
diff --git a/public/web/WebWidgetClient.h b/public/web/WebWidgetClient.h
index 2a3b3b6219d42995f150816bae8967599c87226f..2049e3c957227488012d8587067b39946fa4ca43 100644
--- a/public/web/WebWidgetClient.h
+++ b/public/web/WebWidgetClient.h
@@ -101,11 +101,6 @@ public:
     // Called when a call to WebWidget::animate is required
     virtual void scheduleAnimation() { }
 
-    // Called to query the state of the rendering back-end. Should return true
-    // when scheduleAnimation (or possibly some other cause for another frame)
-    // was called, but before WebWidget::animate actually does a frame.
-    virtual bool isCompositorFramePending() const { return false; }
-
     // Called when the widget acquires or loses focus, respectively.
     virtual void didFocus() { }
     virtual void didBlur() { }