Move string_piece.h to base/strings.

base/strings/string_piece_unittest.cc

 // Copyright (c) 2012 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/strings/string_piece.h"
 #include "base/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 template <typename T>
 class CommonStringPieceTest : public ::testing::Test {
  public:
   static const T as_string(const char* input) {
     return T(input);
@@ skipping 649 matching lines @@
   ASSERT_TRUE(empty == BasicStringPiece<TypeParam>(NULL));
   ASSERT_TRUE(empty == BasicStringPiece<TypeParam>(NULL, 0U));
   ASSERT_TRUE(empty == BasicStringPiece<TypeParam>());
   ASSERT_TRUE(str == BasicStringPiece<TypeParam>(str.begin(), str.end()));
   ASSERT_TRUE(empty == BasicStringPiece<TypeParam>(str.begin(), str.begin()));
   ASSERT_TRUE(empty == BasicStringPiece<TypeParam>(empty));
   ASSERT_TRUE(empty == BasicStringPiece<TypeParam>(empty.begin(), empty.end()));
 }
 
 }  // namespace base