Compute the popup location/size correctly when use-zoom-for-dsf is enabled.

components/plugins/renderer/webview_plugin.cc

Index: components/plugins/renderer/webview_plugin.cc
diff --git a/components/plugins/renderer/webview_plugin.cc b/components/plugins/renderer/webview_plugin.cc
index 29b10080298dc001f660f52c1561390ede745e3a..a8cbe6dc48d828eb9aeecf4d6b52a22e80275a87 100644
--- a/components/plugins/renderer/webview_plugin.cc
+++ b/components/plugins/renderer/webview_plugin.cc
@@ -263,6 +263,11 @@ void WebViewPlugin::startDragging(WebLocalFrame*,
   web_view_->dragSourceSystemDragEnded();
 }
 
+void WebViewPlugin::convertViewportToScreen(blink::WebRect* rect) {
+  // TODO(oshima): Figure out what to do.
+  NOTIMPLEMENTED();
+}
+
 bool WebViewPlugin::allowsBrokenNullLayerTreeView() const {
   return true;
 }