base: Update the include paths of base/string_piece.h to its new location.

base/strings/sys_string_conversions_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/basictypes.h"
-#include "base/string_piece.h"
+#include "base/strings/string_piece.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/test/scoped_locale.h"
 #include "base/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #ifdef WCHAR_T_IS_UTF32
 static const std::wstring kSysWideOldItalicLetterA = L"\x10300";
 #else
 static const std::wstring kSysWideOldItalicLetterA = L"\xd800\xdf00";
 #endif
@@ skipping 159 matching lines @@
   for (size_t i = 0; i < arraysize(kConvertRoundtripCases); ++i) {
     std::wstring wide = kConvertRoundtripCases[i];
     std::wstring trip = UTF8ToWide(SysWideToNativeMB(wide));
     EXPECT_EQ(wide.size(), trip.size());
     EXPECT_EQ(wide, trip);
   }
 }
 #endif  // OS_LINUX
 
 }  // namespace base