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 079ed237a67ce229d9593534e8f8f32a99f2f23d..2c66fc87b75bc2eec200ed6efd28e16208c4a45c 100644
--- a/content/browser/web_contents/web_contents_view_aura.cc
+++ b/content/browser/web_contents/web_contents_view_aura.cc
@@ -1353,6 +1353,14 @@ 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;