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 5e185c19f74a27039f78b1967f7e8b6c18e0cf7e..8f7024bcb11a4bac7be237b52691a8ea3d8e16a8 100644
--- a/components/plugins/renderer/webview_plugin.cc
+++ b/components/plugins/renderer/webview_plugin.cc
@@ -264,6 +264,11 @@ void WebViewPlugin::startDragging(WebLocalFrame*,
   web_view_->dragSourceSystemDragEnded();
 }
 
+void WebViewPlugin::convertViewportToWindow(blink::WebRect* rect) {
+  // TODO(oshima): Figure out what to do.
+  NOTIMPLEMENTED();
+}
+
 bool WebViewPlugin::allowsBrokenNullLayerTreeView() const {
   return true;
 }