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

base/utf_string_conversions.cc

 // Copyright (c) 2010 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 "base/utf_string_conversions.h"
 
-#include "base/string_piece.h"
 #include "base/string_util.h"
+#include "base/strings/string_piece.h"
 #include "base/strings/utf_string_conversion_utils.h"
 
 using base::PrepareForUTF8Output;
 using base::PrepareForUTF16Or32Output;
 using base::ReadUnicodeCharacter;
 using base::WriteUnicodeCharacter;
 
 namespace {
 
 // Generalized Unicode converter -----------------------------------------------
@@ skipping 158 matching lines @@
 
 std::wstring ASCIIToWide(const base::StringPiece& ascii) {
   DCHECK(IsStringASCII(ascii)) << ascii;
   return std::wstring(ascii.begin(), ascii.end());
 }
 
 string16 ASCIIToUTF16(const base::StringPiece& ascii) {
   DCHECK(IsStringASCII(ascii)) << ascii;
   return string16(ascii.begin(), ascii.end());
 }