Clean up some StyleBuilder property application code

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 564 matching lines @@
             String cssURLValue = primitiveValue->getStringValue();
             KURL url = state.document().completeURL(cssURLValue);
             // FIXME: It doesn't work with forward or external SVG references (see https://bugs.webkit.org/show_bug.cgi?id=90405)
             state.style()->setClipPath(ReferenceClipPathOperation::create(cssURLValue, AtomicString(url.fragmentIdentifier())));
         }
     }
 }
 
 void StyleBuilderFunctions::applyValueCSSPropertyWebkitFilter(StyleResolverState& state, CSSValue* value)
 {
+    // FIXME: We should just make this a converter
     FilterOperations operations;
-    if (FilterOperationResolver::createFilterOperations(value, state.cssToLengthConversionData(), operations, state))
-        state.style()->setFilter(operations);
+    FilterOperationResolver::createFilterOperations(*value, state.cssToLengthConversionData(), operations, state);
+    state.style()->setFilter(operations);
 }
 
 void StyleBuilderFunctions::applyInitialCSSPropertyWebkitTextEmphasisStyle(StyleResolverState& state)
 {
     state.style()->setTextEmphasisFill(ComputedStyle::initialTextEmphasisFill());
     state.style()->setTextEmphasisMark(ComputedStyle::initialTextEmphasisMark());
     state.style()->setTextEmphasisCustomMark(ComputedStyle::initialTextEmphasisCustomMark());
 }
 
 void StyleBuilderFunctions::applyInheritCSSPropertyWebkitTextEmphasisStyle(StyleResolverState& state)
@@ skipping 229 matching lines @@
         return;
     case CSSValueSuper:
         svgStyle.setBaselineShift(BS_SUPER);
         return;
     default:
         ASSERT_NOT_REACHED();
     }
 }
 
 } // namespace blink