Removed selector matching check for invalid pseudo elements.

third_party/WebKit/Source/core/css/SelectorChecker.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 262 matching lines @@
     ASSERT(context.selector->tagHistory());
     nextContext.selector = context.selector->tagHistory();
     return nextContext;
 }
 
 SelectorChecker::Match SelectorChecker::matchForSubSelector(const SelectorCheckingContext& context, MatchResult& result) const
 {
     SelectorCheckingContext nextContext = prepareNextContextForRelation(context);
 
     PseudoId dynamicPseudo = result.dynamicPseudo;
-    // a selector is invalid if something follows a pseudo-element
-    // We make an exception for scrollbar pseudo elements and allow a set of pseudo classes (but nothing else)
-    // to follow the pseudo elements.
     nextContext.hasScrollbarPseudo = dynamicPseudo != NOPSEUDO && (context.scrollbar || dynamicPseudo == SCROLLBAR_CORNER || dynamicPseudo == RESIZER);
     nextContext.hasSelectionPseudo = dynamicPseudo == SELECTION;
-    if ((context.inRightmostCompound || m_mode == CollectingCSSRules || m_mode == CollectingStyleRules || m_mode == QueryingRules) && dynamicPseudo != NOPSEUDO
-        && !nextContext.hasSelectionPseudo
-        && !(nextContext.hasScrollbarPseudo && nextContext.selector->match() == CSSSelector::PseudoClass))
-        return SelectorFailsCompletely;
-
     nextContext.isSubSelector = true;
     return matchSelector(nextContext, result);
 }
 
 static inline bool isV0ShadowRoot(const Node* node)
 {
     return node && node->isShadowRoot() && toShadowRoot(node)->type() == ShadowRootType::V0;
 }
 
 SelectorChecker::Match SelectorChecker::matchForPseudoShadow(const SelectorCheckingContext& context, const ContainerNode* node, MatchResult& result) const
@@ skipping 891 matching lines @@
 }
 
 bool SelectorChecker::matchesFocusPseudoClass(const Element& element)
 {
     if (InspectorInstrumentation::forcePseudoState(const_cast<Element*>(&element), CSSSelector::PseudoFocus))
         return true;
     return element.focused() && isFrameFocused(element);
 }
 
 }