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

net/tools/dump_cache/url_to_filename_encoder_unittest.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 "net/tools/dump_cache/url_to_filename_encoder.h"
 
 #include <string>
 #include <vector>
 
-#include "base/string_piece.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
+#include "base/strings/string_piece.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::StringPiece;
 using std::string;
 
 namespace net {
 
 #ifdef WIN32
 char kDirSeparator = '\\';
 char kOtherDirSeparator = '/';
@@ skipping 313 matching lines @@
   EXPECT_EQ(long_word.size() + 4, escaped_word.size());
   ASSERT_LT(UrlToFilenameEncoder::kMaximumSubdirectoryLength,
             escaped_word.size());
   // Check that the backslash got inserted at the correct spot.
   EXPECT_EQ('\\', escaped_word[
       UrlToFilenameEncoder::kMaximumSubdirectoryLength]);
 }
 
 }  // namespace net