Make drag and drop work on webpage. Also slightly modify drag drop workflow.

ui/views/widget/native_widget_aura.cc

Index: ui/views/widget/native_widget_aura.cc
diff --git a/ui/views/widget/native_widget_aura.cc b/ui/views/widget/native_widget_aura.cc
index 7b1805e19e618da5d2093bf803acd7820315d121..bcb14a7d6b89cb5c96a571735034fa902edebcff 100644
--- a/ui/views/widget/native_widget_aura.cc
+++ b/ui/views/widget/native_widget_aura.cc
@@ -658,14 +658,6 @@ void NativeWidgetAura::OnWindowVisibilityChanged(bool visible) {
   delegate_->OnNativeWidgetVisibilityChanged(visible);
 }
 
-bool NativeWidgetAura::CanDrop(const aura::DropTargetEvent& event) {
-  DCHECK(drop_helper_.get() != NULL);
-  View* view = drop_helper_->target_view();
-  if (view)
-    return view->CanDrop(event.data());
-  return false;
-}
-
 void NativeWidgetAura::OnDragEntered(const aura::DropTargetEvent& event) {
   DCHECK(drop_helper_.get() != NULL);
   drop_helper_->OnDragOver(event.data(), event.location(),