Remove ShadowDOMV1 runtime flag (status=stable)

third_party/WebKit/Source/core/css/parser/CSSSelectorParser.cpp

 // Copyright 2014 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 "core/css/parser/CSSSelectorParser.h"
 
 #include "core/css/CSSSelectorList.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/frame/UseCounter.h"
 #include "platform/RuntimeEnabledFeatures.h"
@@ skipping 539 matching lines @@
       selectorVector.append(std::move(innerSelector));
       selector->adoptSelectorVector(selectorVector);
       return selector;
     }
     case CSSSelector::PseudoSlotted: {
       DisallowPseudoElementsScope scope(this);
 
       std::unique_ptr<CSSParserSelector> innerSelector =
           consumeCompoundSelector(block);
       block.consumeWhitespace();
-      if (!innerSelector || !block.atEnd() ||
-          !RuntimeEnabledFeatures::shadowDOMV1Enabled())
+      if (!innerSelector || !block.atEnd())
         return nullptr;
       Vector<std::unique_ptr<CSSParserSelector>> selectorVector;
       selectorVector.append(std::move(innerSelector));
       selector->adoptSelectorVector(selectorVector);
       return selector;
     }
     case CSSSelector::PseudoLang: {
       // FIXME: CSS Selectors Level 4 allows :lang(*-foo)
       const CSSParserToken& ident = block.consumeIncludingWhitespace();
       if (ident.type() != IdentToken || !block.atEnd())
@@ skipping 302 matching lines @@
       splitAfter->releaseTagHistory();
   secondCompound->appendTagHistory(
       secondCompound->pseudoType() == CSSSelector::PseudoSlotted
           ? CSSSelector::ShadowSlot
           : CSSSelector::ShadowPseudo,
       std::move(compoundSelector));
   return secondCompound;
 }
 
 }  // namespace blink