De-duplicate common code from StringPiece, StringPiece16, and their tests.

base/string_piece_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 "base/string16.h"
 #include "base/string_piece.h"
 #include "base/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 736 matching lines @@
 
 TEST(StringPiece16Test, CheckNULL) {
   StringPiece16 s(NULL);
   ASSERT_EQ(s.data(), (const char16*)NULL);
   ASSERT_EQ(s.size(), 0U);
 
   s.set(NULL);
   ASSERT_EQ(s.data(), (const char16*)NULL);
   ASSERT_EQ(s.size(), 0U);
 
-  string16 str = s.as_string16();
+  string16 str = s.as_string();
   ASSERT_EQ(s.data(), (const char16*)NULL);
   ASSERT_EQ(s.size(), 0U);
 }
 
 TEST(StringPiece16Test, HeterogenousStringPieceEquals) {
   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("hello")) == ASCIIToUTF16("hello"));
 }
 
 TEST(StringPiece16Test, CheckConversion) {
   // Make sure that we can convert from UTF8 to UTF16 and back. We use a two
   // byte character (G clef) to test this.
   ASSERT_EQ(
       UTF16ToUTF8(
-          StringPiece16(UTF8ToUTF16("\xf0\x9d\x84\x9e")).as_string16()),
+          StringPiece16(UTF8ToUTF16("\xf0\x9d\x84\x9e")).as_string()),
       "\xf0\x9d\x84\x9e");
 }
 
 }  // namespace base