Keep formatting tags included when it is cut or copied.

third_party/WebKit/Source/core/editing/serializers/Serialization.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009, 2010, 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011 Igalia S.L.
  * Copyright (C) 2011 Motorola Mobility. 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
@@ skipping 151 matching lines @@
     if (!style)
         return false;
     const CSSValue* value = style->getPropertyCSSValue(propertyID);
     if (!value)
         return true;
     if (!value->isPrimitiveValue())
         return false;
     return toCSSPrimitiveValue(value)->getValueID() == CSSValueNone;
 }
 
-static bool isPresentationalHTMLElement(const Node* node)
-{
-    if (!node->isHTMLElement())
-        return false;
-
-    const HTMLElement& element = toHTMLElement(*node);
-    return element.hasTagName(uTag) || element.hasTagName(sTag) || element.hasTagName(strikeTag)
-        || element.hasTagName(iTag) || element.hasTagName(emTag) || element.hasTagName(bTag) || element.hasTagName(strongTag);
-}
-
 template<typename Strategy>
 static HTMLElement* highestAncestorToWrapMarkup(const PositionTemplate<Strategy>& startPosition, const PositionTemplate<Strategy>& endPosition, EAnnotateForInterchange shouldAnnotate, Node* constrainingAncestor)
 {
     Node* firstNode = startPosition.nodeAsRangeFirstNode();
     // For compatibility reason, we use container node of start and end
     // positions rather than first node and last node in selection.
     Node* commonAncestor = Strategy::commonAncestor(*startPosition.computeContainerNode(), *endPosition.computeContainerNode());
     DCHECK(commonAncestor);
     HTMLElement* specialCommonAncestor = nullptr;
     if (shouldAnnotate == AnnotateForInterchange) {
@@ skipping 493 matching lines @@
     Text* textNext = toText(next);
     textNode->appendData(textNext->data());
     if (textNext->parentNode()) // Might have been removed by mutation event.
         textNext->remove(exceptionState);
 }
 
 template class CORE_TEMPLATE_EXPORT CreateMarkupAlgorithm<EditingStrategy>;
 template class CORE_TEMPLATE_EXPORT CreateMarkupAlgorithm<EditingInFlatTreeStrategy>;
 
 } // namespace blink