Revert of Allow std::unordered_*.

ui/base/x/selection_utils.cc

 // Copyright (c) 2013 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 "ui/base/x/selection_utils.h"
 
 #include <stdint.h>
 
-#include <algorithm>
 #include <set>
 
 #include "base/i18n/icu_string_conversions.h"
 #include "base/logging.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/base/clipboard/clipboard.h"
 #include "ui/base/x/x11_util.h"
 #include "ui/gfx/x/x11_atom_cache.h"
@@ skipping 228 matching lines @@
 
 void SelectionData::AssignTo(std::string* result) const {
   *result = RefCountedMemoryToString(memory_);
 }
 
 void SelectionData::AssignTo(base::string16* result) const {
   *result = RefCountedMemoryToString16(memory_);
 }
 
 }  // namespace ui