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

base/i18n/break_iterator_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 "base/i18n/break_iterator.h"
 
-#include "base/string_piece.h"
 #include "base/stringprintf.h"
+#include "base/strings/string_piece.h"
 #include "base/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 namespace i18n {
 
 TEST(BreakIteratorTest, BreakWordEmpty) {
   string16 empty;
   BreakIterator iter(empty, BreakIterator::BREAK_WORD);
   ASSERT_TRUE(iter.Init());
@@ skipping 310 matching lines @@
   BreakIterator iter(text, BreakIterator::BREAK_CHARACTER);
   ASSERT_TRUE(iter.Init());
   for (size_t i = 0; i < arraysize(kCharacters); ++i) {
     EXPECT_TRUE(iter.Advance());
     EXPECT_EQ(characters[i], iter.GetString());
   }
 }
 
 }  // namespace i18n
 }  // namespace base