Include <algorithm> if you use functions from <algorithm>.

third_party/WebKit/Source/core/editing/commands/CompositeEditCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 55 matching lines @@
 #include "core/html/HTMLBRElement.h"
 #include "core/html/HTMLDivElement.h"
 #include "core/html/HTMLElement.h"
 #include "core/html/HTMLLIElement.h"
 #include "core/html/HTMLQuoteElement.h"
 #include "core/html/HTMLSpanElement.h"
 #include "core/layout/LayoutBlock.h"
 #include "core/layout/LayoutListItem.h"
 #include "core/layout/LayoutText.h"
 #include "core/layout/line/InlineTextBox.h"
+#include <algorithm>
 
 namespace blink {
 
 using namespace HTMLNames;
 
 PassRefPtrWillBeRawPtr<EditCommandComposition> EditCommandComposition::create(Document* document,
     const VisibleSelection& startingSelection, const VisibleSelection& endingSelection, EditAction editAction)
 {
     return adoptRefWillBeNoop(new EditCommandComposition(document, startingSelection, endingSelection, editAction));
 }
@@ skipping 1416 matching lines @@
 }
 
 DEFINE_TRACE(CompositeEditCommand)
 {
     visitor->trace(m_commands);
     visitor->trace(m_composition);
     EditCommand::trace(visitor);
 }
 
 } // namespace blink