Cleanup: Convert ASCIIToUTF16("") to string16().

ui/views/controls/textfield/native_textfield_views_unittest.cc

 // Copyright (c) 2011 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 <string>
 #include <vector>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/message_loop.h"
 #include "base/pickle.h"
+#include "base/string16.h"
 #include "base/utf_string_conversions.h"
 #include "googleurl/src/gurl.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/clipboard/clipboard.h"
 #include "ui/base/clipboard/scoped_clipboard_writer.h"
 #include "ui/base/dragdrop/drag_drop_types.h"
 #include "ui/base/ime/text_input_client.h"
 #include "ui/base/keycodes/keyboard_codes.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/render_text.h"
@@ skipping 352 matching lines @@
   InitTextfield(Textfield::STYLE_DEFAULT);
   SendKeyEvent(ui::VKEY_C, true, false);
   EXPECT_STR_EQ("C", textfield_->text());
   EXPECT_STR_EQ("C", last_contents_);
   last_contents_.clear();
 
   SendKeyEvent(ui::VKEY_R, false, false);
   EXPECT_STR_EQ("Cr", textfield_->text());
   EXPECT_STR_EQ("Cr", last_contents_);
 
-  textfield_->SetText(ASCIIToUTF16(""));
+  textfield_->SetText(string16());
   SendKeyEvent(ui::VKEY_C, true, false, true);
   SendKeyEvent(ui::VKEY_C, false, false, true);
   SendKeyEvent(ui::VKEY_1, false, false, true);
   SendKeyEvent(ui::VKEY_1, true, false, true);
   SendKeyEvent(ui::VKEY_1, true, false, false);
   EXPECT_STR_EQ("cC1!!", textfield_->text());
   EXPECT_STR_EQ("cC1!!", last_contents_);
 }
 
 TEST_F(NativeTextfieldViewsTest, ControlAndSelectTest) {
@@ skipping 1167 matching lines @@
 #else
   EXPECT_EQ(500U, textfield_->GetCursorPosition());
 #endif
 #endif  // !defined(OS_WIN)
 
   // Reset locale.
   base::i18n::SetICUDefaultLocale(locale);
 }
 
 }  // namespace views