Make browser windows override_redirect when dragging tabs.

ash/host/ash_window_tree_host_unified.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/host/ash_window_tree_host_unified.h"
 #include "ash/host/root_window_transformer.h"
 #include "ash/ime/input_method_event_handler.h"
 #include "base/logging.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
@@ skipping 64 matching lines @@
       make_scoped_ptr(new UnifiedEventTargeter(src_root, window())));
   DCHECK(std::find(mirroring_hosts_.begin(), mirroring_hosts_.end(),
                    mirroring_ash_host) == mirroring_hosts_.end());
   mirroring_hosts_.push_back(mirroring_ash_host);
   mirroring_ash_host->AsWindowTreeHost()->window()->AddObserver(this);
 }
 
 void AshWindowTreeHostUnified::ToggleFullScreen() {
 }
 
+void AshWindowTreeHostUnified::RemapAsNormalWindow() {}
+
 bool AshWindowTreeHostUnified::ConfineCursorToRootWindow() {
   return true;
 }
 
 void AshWindowTreeHostUnified::UnConfineCursor() {
 }
 
 void AshWindowTreeHostUnified::SetRootWindowTransformer(
     scoped_ptr<RootWindowTransformer> transformer) {
   transformer_helper_.SetRootWindowTransformer(transformer.Pass());
@@ skipping 87 matching lines @@
     ui::KeyEvent* event) {
   input_method_handler()->SetPostIME(true);
   ui::EventDispatchDetails details =
       event_processor()->OnEventFromSource(event);
   if (!details.dispatcher_destroyed)
     input_method_handler()->SetPostIME(false);
   return details;
 }
 
 }  // namespace ash