Allow whitespace at end of :not() pseudo-class, i.e. :not(div )

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 "config.h"
 #include "core/css/parser/CSSSelectorParser.h"
 
 #include "core/css/CSSSelectorList.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/frame/UseCounter.h"
@@ skipping 291 matching lines @@
             return nullptr;
 
         selector->setSelectorList(adoptPtr(selectorList));
         selector->pseudoType(); // FIXME: Do we need to force the pseudo type to be cached?
         ASSERT(selector->pseudoType() != CSSSelector::PseudoUnknown);
         return selector.release();
     }
 
     if (colons == 1 && token.valueEqualsIgnoringCase("not")) {
         OwnPtr<CSSParserSelector> innerSelector = consumeCompoundSelector(block);
+        block.consumeWhitespace();
         if (!innerSelector || !innerSelector->isSimple() || !block.atEnd())
             return nullptr;
         Vector<OwnPtr<CSSParserSelector>> selectorVector;
         selectorVector.append(innerSelector.release());
         selector->adoptSelectorVector(selectorVector);
         return selector.release();
     }
 
     if (colons == 1 && token.valueEqualsIgnoringCase("lang")) {
         // FIXME: CSS Selectors Level 4 allows :lang(*-foo)
@@ skipping 354 matching lines @@
                 context.useCounter()->count(feature);
             if (current->relation() == CSSSelector::ShadowDeep)
                 context.useCounter()->count(UseCounter::CSSDeepCombinator);
             if (current->selectorList())
                 recordSelectorStats(context, *current->selectorList());
         }
     }
 }
 
 } // namespace blink