Update some uses of UTF conversions in chrome/browser to use the base:: namespace.

chrome/browser/ui/cocoa/autofill/autofill_section_container_unittest.mm

 // Copyright (c) 2013 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.
 
 #import "chrome/browser/ui/cocoa/autofill/autofill_section_container.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/ui/autofill/autofill_dialog_models.h"
 #include "chrome/browser/ui/autofill/mock_autofill_dialog_view_delegate.h"
 #import "chrome/browser/ui/cocoa/autofill/autofill_input_field.h"
 #import "chrome/browser/ui/cocoa/autofill/layout_view.h"
 #import "chrome/browser/ui/cocoa/menu_button.h"
 #include "grit/generated_resources.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 #include "ui/base/models/combobox_model.h"
 #include "ui/base/models/simple_menu_model.h"
 #import "ui/base/test/ui_cocoa_test_helper.h"
 
+using base::ASCIIToUTF16;
+
 namespace {
 
 class AutofillSectionContainerTest : public ui::CocoaTest {
  public:
   AutofillSectionContainerTest() : section_(autofill::SECTION_BILLING) {}
   virtual void SetUp() {
     CocoaTest::SetUp();
     ResetContainer();
   }
 
@@ skipping 213 matching lines @@
   EXPECT_TRUE([field invalid]);
   field = [container_ getField:CREDIT_CARD_EXP_MONTH];
   EXPECT_FALSE([field invalid]);
 
   [container_ validateFor:VALIDATE_FINAL];
   field = [container_ getField:EMAIL_ADDRESS];
   EXPECT_FALSE([field invalid]);
   field = [container_ getField:CREDIT_CARD_EXP_MONTH];
   EXPECT_TRUE([field invalid]);
 }