MacViewsBrowser: Fix omnibox crash due to failed DCHECK.

ui/app_list/views/search_box_view_unittest.cc

 // Copyright 2014 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/app_list/views/search_box_view.h"
 
 #include <cctype>
 #include <map>
 
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/app_list/test/app_list_test_view_delegate.h"
 #include "ui/app_list/views/search_box_view_delegate.h"
 #include "ui/views/controls/textfield/textfield.h"
+#include "ui/views/controls/textfield/textfield_test_api.h"
 #include "ui/views/test/widget_test.h"
 
 namespace app_list {
 namespace test {
 
 class KeyPressCounterView : public views::View {
  public:
   KeyPressCounterView() : count_(0) {}
   ~KeyPressCounterView() override {}
 
@@ skipping 54 matching lines @@
   void ResetAutoLaunchTimeout() {
     view_delegate_.set_auto_launch_timeout(base::TimeDelta());
   }
 
   int GetContentsViewKeyPressCountAndReset() {
     return counter_view_->GetCountAndReset();
   }
 
   void KeyPress(ui::KeyboardCode key_code) {
     ui::KeyEvent event(ui::ET_KEY_PRESSED, key_code, ui::EF_NONE);
-    view_->search_box()->OnKeyPressed(event);
+    views::TextfieldTestApi test_api_(view_->search_box());
+    test_api_.OnKeyPressed(event);
     // Emulates the input method.
     if (::isalnum(static_cast<int>(key_code))) {
       base::char16 character = ::tolower(static_cast<int>(key_code));
       view_->search_box()->InsertText(base::string16(1, character));
     }
   }
 
   std::string GetLastQueryAndReset() {
     base::string16 query = last_query_;
     last_query_.clear();
@@ skipping 59 matching lines @@
   ResetAutoLaunchTimeout();
 
   // Clearing search box also cancels.
   SetLongAutoLaunchTimeout();
   view()->ClearSearch();
   EXPECT_EQ(base::TimeDelta(), GetAutoLaunchTimeout());
 }
 
 }  // namespace test
 }  // namespace app_list