Add utf_string_conversions to base namespace.

chrome/test/chromedriver/keycode_text_conversion_unittest.cc

 // 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.
 
 #include <string>
 
 #include "base/string16.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/test/chromedriver/keycode_text_conversion.h"
 #include "chrome/test/chromedriver/test_util.h"
@@ skipping 12 matching lines @@
   int actual_modifiers = 0;
   ASSERT_TRUE(ConvertCharToKeyCode(
       character_utf16, &actual_key_code, &actual_modifiers));
   EXPECT_EQ(key_code, actual_key_code) << "Char: " << character;
   EXPECT_EQ(modifiers, actual_modifiers) << "Char: " << character;
 }
 
 void CheckCantConvertChar(wchar_t character) {
   std::wstring character_string;
   character_string.push_back(character);
-  char16 character_utf16 = WideToUTF16(character_string)[0];
+  char16 character_utf16 = base::WideToUTF16(character_string)[0];
   ui::KeyboardCode actual_key_code = ui::VKEY_UNKNOWN;
   int actual_modifiers = 0;
   EXPECT_FALSE(ConvertCharToKeyCode(
       character_utf16, &actual_key_code, &actual_modifiers));
 }
 
 }  // namespace
 
 #if defined(OS_LINUX)
 // Fails on bots: crbug.com/174962
@@ skipping 81 matching lines @@
 #if defined(OS_WIN)
   ASSERT_TRUE(SwitchKeyboardLayout("00000408"));  // greek
   CheckCharToKeyCode(';', ui::VKEY_Q, 0);
   EXPECT_EQ(";", ConvertKeyCodeToText(ui::VKEY_Q, 0));
 #elif defined(OS_MACOSX)
   ASSERT_TRUE(SwitchKeyboardLayout("com.apple.keylayout.German"));
   CheckCharToKeyCode('z', ui::VKEY_Y, 0);
   EXPECT_EQ("z", ConvertKeyCodeToText(ui::VKEY_Y, 0));
 #endif
 }