Make javascript dialogs into top-level windows.

ui/views/widget/desktop_aura/desktop_native_widget_aura.cc

 // Copyright (c) 2012 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 "ui/views/widget/desktop_aura/desktop_native_widget_aura.h"
 
 #include "base/bind.h"
 #include "ui/aura/client/activation_client.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/stacking_client.h"
@@ skipping 527 matching lines @@
   if (window_)
     window_->SchedulePaintInRect(rect);
 }
 
 void DesktopNativeWidgetAura::SetCursor(gfx::NativeCursor cursor) {
   desktop_root_window_host_->AsRootWindowHost()->SetCursor(cursor);
 }
 
 void DesktopNativeWidgetAura::ClearNativeFocus() {
   desktop_root_window_host_->ClearNativeFocus();
-  aura::client::GetFocusClient(window_)->ResetFocusWithinActiveWindow(window_);
+
+  if (ShouldActivate()) {
+    aura::client::GetFocusClient(window_)->
+        ResetFocusWithinActiveWindow(window_);
+  }
 }
 
 gfx::Rect DesktopNativeWidgetAura::GetWorkAreaBoundsInScreen() const {
   return desktop_root_window_host_->GetWorkAreaBoundsInScreen();
 }
 
 void DesktopNativeWidgetAura::SetInactiveRenderingDisabled(bool value) {
   if (!value) {
     active_window_observer_.reset();
   } else {
@@ skipping 274 matching lines @@
   drop_helper_->OnDragExit();
 }
 
 int DesktopNativeWidgetAura::OnPerformDrop(const ui::DropTargetEvent& event) {
   DCHECK(drop_helper_.get() != NULL);
   return drop_helper_->OnDrop(event.data(), event.location(),
       last_drop_operation_);
 }
 
 }  // namespace views