Use invalidation sets for :invalid/:valid/:required/:optional.

Source/core/dom/StyleChangeReason.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/dom/StyleChangeReason.h"
 
 #include "platform/TraceEvent.h"
 #include "wtf/MainThread.h"
 #include "wtf/StaticConstructors.h"
@@ skipping 31 matching lines @@
 const char VisuallyOrdered[] = "VisuallyOrdered";
 const char WritingModeChange[] = "WritingModeChange";
 const char Zoom[] = "Zoom";
 } // namespace StyleChangeReasonForTracing
 
 namespace StyleChangeExtraData {
 DEFINE_GLOBAL(AtomicString, Active)
 DEFINE_GLOBAL(AtomicString, Disabled)
 DEFINE_GLOBAL(AtomicString, Focus)
 DEFINE_GLOBAL(AtomicString, Hover)
-DEFINE_GLOBAL(AtomicString, Invalid)
 DEFINE_GLOBAL(AtomicString, Unresolved)
 
 void init()
 {
     ASSERT(isMainThread());
 
     new (NotNull, (void*)&Active) AtomicString(":active", AtomicString::ConstructFromLiteral);
     new (NotNull, (void*)&Disabled) AtomicString(":disabled", AtomicString::ConstructFromLiteral);
     new (NotNull, (void*)&Focus) AtomicString(":focus", AtomicString::ConstructFromLiteral);
     new (NotNull, (void*)&Hover) AtomicString(":hover", AtomicString::ConstructFromLiteral);
-    new (NotNull, (void*)&Invalid) AtomicString(":invalid", AtomicString::ConstructFromLiteral);
     new (NotNull, (void*)&Unresolved) AtomicString(":unresolved", AtomicString::ConstructFromLiteral);
 }
 
 } // namespace StyleChangeExtraData
 
 } // namespace blink