DevTools: simplify WI.CSSProperty and WI.CSSStyleDeclaration interfaces

Source/devtools/front_end/elements/StylesSectionModel.js

 // Copyright (c) 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.
 
 /**
  * @constructor
  * @param {!WebInspector.SectionCascade} cascade
  * @param {?WebInspector.CSSRule} rule
  * @param {!WebInspector.CSSStyleDeclaration} style
  * @param {string} customSelectorText
@@ skipping 310 matching lines @@
         /** @type {!Set.<string>} */
         var styleRuleUsedProperties = new Set();
         stylesUsedProperties.push(styleRuleUsedProperties);
         if (!styleRule.hasMatchingSelectors())
             continue;
 
         var style = styleRule.style();
         var allProperties = style.allProperties;
         for (var j = 0; j < allProperties.length; ++j) {
             var property = allProperties[j];
-            if (!property.isLive || !property.parsedOk)
+            if (!property.activeInStyle())
                 continue;
 
             // Do not pick non-inherited properties from inherited styles.
             if (styleRule.inherited() && !WebInspector.CSSMetadata.isPropertyInherited(property.name))
                 continue;
 
             var canonicalName = WebInspector.CSSMetadata.canonicalPropertyName(property.name);
             if (foundImportantProperties.has(canonicalName))
                 continue;
 
@@ skipping 14 matching lines @@
                     propertyToEffectiveRule.get(canonicalName).delete(canonicalName);
             }
 
             styleRuleUsedProperties.add(canonicalName);
             allUsedProperties.add(canonicalName);
             propertyToEffectiveRule.set(canonicalName, styleRuleUsedProperties);
         }
     }
     return stylesUsedProperties;
 }