Revert "Fix dismissal of select popups on NotifyMoveOrResizeStarted (see issue #3294)"

This reverts commit 5f4bccd672.

Reason for revert: This change causes a native parented browser to lose focus
on move (fixes issue #3426).

libcef/common/mojom/cef.mojom

@@ -79,6 +79,10 @@ interface RenderFrame {
 
   // Loading has stopped.
   DidStopLoading();
+
+  // Move or resize of the renderer's containing window has started. Used on
+  // Windows and Linux with the Alloy runtime.
+  MoveOrResizeStarted();
 };
 
 // Interface for communicating with a frame in the browser process.