Remove grow box rect support, renderer part.

third_party/WebKit/public/web/WebWidget.h

Index: third_party/WebKit/public/web/WebWidget.h
diff --git a/third_party/WebKit/public/web/WebWidget.h b/third_party/WebKit/public/web/WebWidget.h
index d986d3fdfce869d50764a002232bb536f4b6461c..9aaff92215899fec7b37787c78686286bf73974c 100644
--- a/third_party/WebKit/public/web/WebWidget.h
+++ b/third_party/WebKit/public/web/WebWidget.h
@@ -235,12 +235,6 @@ class WebWidget {
   // reasons such as the user exiting lock, window focus changing, etc.
   virtual void didLosePointerLock() {}
 
-  // Informs the WebWidget that the resizer rect changed. Happens for example
-  // on mac, when a widget appears below the WebWidget without changing the
-  // WebWidget's size (WebWidget::resize() automatically checks the resizer
-  // rect.)
-  virtual void didChangeWindowResizerRect() {}
-
   // The page background color. Can be used for filling in areas without
   // content.
   virtual WebColor backgroundColor() const {