Change grow box computation back to a method on BrowserWindow

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index ff139dd5d5104f61dabd98f1f641e1741a56a181..e60c7939b44cc8786a15458442db9b725ac4a439 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -271,9 +271,6 @@ void RenderWidget::OnResize(const gfx::Size& new_size,
   if (!webwidget_)
     return;
 
-  // We shouldn't be asked to resize to our current size.
-  DCHECK(size_ != new_size || resizer_rect_ != resizer_rect);
-
   // Remember the rect where the resize corner will be drawn.
   resizer_rect_ = resizer_rect;
 
@@ -824,7 +821,6 @@ void RenderWidget::DoDeferredUpdate() {
   pending_update_params_->dy = update.scroll_delta.y();
   pending_update_params_->scroll_rect = update.scroll_rect;
   pending_update_params_->view_size = size_;
-  pending_update_params_->resizer_rect = resizer_rect_;
   pending_update_params_->plugin_window_moves.swap(plugin_window_moves_);
   pending_update_params_->flags = next_paint_flags_;
   pending_update_params_->scroll_offset = GetScrollOffset();
@@ -1049,7 +1045,6 @@ void RenderWidget::didCompleteSwapBuffers() {
 
   ViewHostMsg_UpdateRect_Params params;
   params.view_size = size_;
-  params.resizer_rect = resizer_rect_;
   params.plugin_window_moves.swap(plugin_window_moves_);
   params.flags = next_paint_flags_;
   params.scroll_offset = GetScrollOffset();