Remove no-op did(De)activateCompositor calls

public/web/WebWidgetClient.h

Index: public/web/WebWidgetClient.h
diff --git a/public/web/WebWidgetClient.h b/public/web/WebWidgetClient.h
index 2049e3c957227488012d8587067b39946fa4ca43..277e84a14c4ab601d29072fad0ea2d8107235afb 100644
--- a/public/web/WebWidgetClient.h
+++ b/public/web/WebWidgetClient.h
@@ -58,10 +58,6 @@ public:
     // Called when the Widget has changed size as a result of an auto-resize.
     virtual void didAutoResize(const WebSize& newSize) { }
 
-    // Called when the compositor is enabled or disabled.
-    virtual void didActivateCompositor() { }
-    virtual void didDeactivateCompositor() { }
-
     // Attempt to initialize compositing for this widget. If this is successful,
     // layerTreeView() will return a valid WebLayerTreeView.
     virtual void initializeLayerTreeView() { }