Fixes for views_unittests on Mac after InputMethodBridge removal (DO NOT COMMIT)

ui/views/controls/textfield/textfield_unittest.cc

Index: ui/views/controls/textfield/textfield_unittest.cc
diff --git a/ui/views/controls/textfield/textfield_unittest.cc b/ui/views/controls/textfield/textfield_unittest.cc
index 11745e2b244a7dac7ae01e1e80b171c88c7f06d8..69d5d2c453364d21373727da6ccd094f7a5bd226 100644
--- a/ui/views/controls/textfield/textfield_unittest.cc
+++ b/ui/views/controls/textfield/textfield_unittest.cc
@@ -13,8 +13,6 @@
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/accessibility/ax_view_state.h"
-#include "ui/aura/window.h"
-#include "ui/aura/window_tree_host.h"
 #include "ui/base/clipboard/clipboard.h"
 #include "ui/base/clipboard/scoped_clipboard_writer.h"
 #include "ui/base/dragdrop/drag_drop_types.h"
@@ -409,8 +407,8 @@ class TextfieldTest : public ViewsTestBase, public TextfieldController {
 
     params.bounds = gfx::Rect(100, 100, 100, 100);
     widget_->Init(params);
-    input_method_->SetDelegate(static_cast<ui::internal::InputMethodDelegate*>(
-        widget_->GetNativeWindow()->GetRootWindow()->GetHost()));
+    input_method_->SetDelegate(
+        test::WidgetTest::GetInputMethodDelegateForWidget(widget_));
     View* container = new View();
     widget_->SetContentsView(container);
     container->AddChildView(textfield_);