Remove final RenderWidgetHostImpl dependency from OverscrollController

content/browser/web_contents/web_contents_view_aura.cc

Index: content/browser/web_contents/web_contents_view_aura.cc
diff --git a/content/browser/web_contents/web_contents_view_aura.cc b/content/browser/web_contents/web_contents_view_aura.cc
index 2b33dab8b71c38a640e3abb36921cb0500faf3df..eab057d426b9e998f2717ed3a7b829214513a849 100644
--- a/content/browser/web_contents/web_contents_view_aura.cc
+++ b/content/browser/web_contents/web_contents_view_aura.cc
@@ -1357,6 +1357,14 @@ void WebContentsViewAura::TakeFocus(bool reverse) {
 ////////////////////////////////////////////////////////////////////////////////
 // WebContentsViewAura, OverscrollControllerDelegate implementation:
 
+gfx::Rect WebContentsViewAura::GetVisibleBounds() const {
+  RenderWidgetHostView* rwhv = web_contents_->GetRenderWidgetHostView();
+  if (!rwhv || !rwhv->IsShowing())
+    return gfx::Rect();
+
+  return rwhv->GetViewBounds();
+}
+
 void WebContentsViewAura::OnOverscrollUpdate(float delta_x, float delta_y) {
   if (current_overscroll_gesture_ == OVERSCROLL_NONE)
     return;