Change requiresLineBox to return false for empty-text inline.

third_party/WebKit/Source/core/layout/line/BreakingContextInlineHeaders.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 188 matching lines @@
 inline bool alwaysRequiresLineBox(LineLayoutItem flow)
 {
     // FIXME: Right now, we only allow line boxes for inlines that are truly empty.
     // We need to fix this, though, because at the very least, inlines containing only
     // ignorable whitespace should should also have line boxes.
     return isEmptyInline(flow) && LineLayoutInline(flow).hasInlineDirectionBordersPaddingOrMargin();
 }
 
 inline bool requiresLineBox(const InlineIterator& it, const LineInfo& lineInfo = LineInfo(), WhitespacePosition whitespacePosition = LeadingWhitespace)
 {
+    if (it.getLineLayoutItem().isEmptyText())
+        return false;
+
     if (it.getLineLayoutItem().isFloatingOrOutOfFlowPositioned())
         return false;
 
     if (it.getLineLayoutItem().isLayoutInline() && !alwaysRequiresLineBox(it.getLineLayoutItem()) && !requiresLineBoxForContent(LineLayoutInline(it.getLineLayoutItem()), lineInfo))
         return false;
 
     if (!shouldCollapseWhiteSpace(it.getLineLayoutItem().styleRef(), lineInfo, whitespacePosition) || it.getLineLayoutItem().isBR())
         return true;
 
     UChar current = it.current();
@@ skipping 971 matching lines @@
 
     if (style.getTextIndentType() == TextIndentHanging)
         indentText = indentText == IndentText ? DoNotIndentText : IndentText;
 
     return indentText;
 }
 
 } // namespace blink
 
 #endif // BreakingContextInlineHeaders_h