Revert 177182 - ViewTest.ChangeNativeViewHierarchyFindRoots failure

chrome/browser/ui/app_modal_dialogs/javascript_app_modal_dialog.cc

Index: chrome/browser/ui/app_modal_dialogs/javascript_app_modal_dialog.cc
===================================================================
--- chrome/browser/ui/app_modal_dialogs/javascript_app_modal_dialog.cc	(revision 177189)
+++ chrome/browser/ui/app_modal_dialogs/javascript_app_modal_dialog.cc	(working copy)
@@ -10,10 +10,6 @@
 #include "content/public/browser/web_contents_view.h"
 #include "ui/base/text/text_elider.h"
 
-#if defined(USE_AURA)
-#include "ui/aura/root_window.h"
-#endif
-
 using content::JavaScriptDialogCreator;
 using content::WebContents;
 
@@ -84,13 +80,6 @@
 NativeAppModalDialog* JavaScriptAppModalDialog::CreateNativeDialog() {
   gfx::NativeWindow parent_window =
       web_contents()->GetView()->GetTopLevelNativeWindow();
-#if defined(USE_AURA)
-  if (!parent_window->GetRootWindow()) {
-    // When we are part of a WebContents that isn't actually being displayed on
-    // the screen, we can't actually attach to it.
-    parent_window = NULL;
-  }
-#endif
   return NativeAppModalDialog::CreateNativeJavaScriptPrompt(this,
                                                             parent_window);
 }