Simplify watched selector handling and remove remnants of user stylesheets

Source/core/css/resolver/StyleBuilderCustom.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * 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.
@@ skipping 1160 matching lines @@
         return;
     }
 
     if (!primitiveValue->isLength())
         return;
     float perspectiveValue = primitiveValue->computeLength<float>(state.cssToLengthConversionData());
     if (perspectiveValue >= 0.0f)
         state.style()->setPerspective(perspectiveValue);
 }
 
-void StyleBuilderFunctions::applyInitialCSSPropertyInternalCallback(StyleResolverState& state)
-{
-}
-
-void StyleBuilderFunctions::applyInheritCSSPropertyInternalCallback(StyleResolverState& state)
-{
-}
-
-void StyleBuilderFunctions::applyValueCSSPropertyInternalCallback(StyleResolverState& state, CSSValue* value)
-{
-    if (value->isPrimitiveValue() && toCSSPrimitiveValue(value)->getValueID() == CSSValueInternalPresence)
-        state.style()->addCallbackSelector(state.currentRule()->selectorList().selectorsText());
-}
-
 void StyleBuilderFunctions::applyValueCSSPropertyWebkitWritingMode(StyleResolverState& state, CSSValue* value)
 {
     if (value->isPrimitiveValue())
         state.setWritingMode(*toCSSPrimitiveValue(value));
 
     // FIXME: It is not ok to modify document state while applying style.
     if (state.element() && state.element() == state.document().documentElement())
         state.document().setWritingModeSetOnDocumentElement(true);
 }
 
@@ skipping 90 matching lines @@
         break;
     default:
         ASSERT_NOT_REACHED();
         break;
     }
 
     state.style()->setGridAutoFlow(autoFlow);
 }
 
 } // namespace blink