Fix copying from interstitial pages on OSX by going through the RenderWidgetHostDelegate.

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 812a1d7ff4246c3608711888c42325830a2caf89..38a7fa1a89b22991ad1648c05177e69c383e87c0 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -1981,6 +1981,10 @@ void RenderWidgetHostImpl::DelayedAutoResized() {
   OnRenderAutoResized(new_size);
 }
 
+RenderWidgetHostDelegate* RenderWidgetHostImpl::GetDelegate() {
+  return delegate_;
+}
+
 void RenderWidgetHostImpl::DetachDelegate() {
   delegate_ = NULL;
 }