DevTools: kill WebInspector.StylesSectionModel class

third_party/WebKit/LayoutTests/http/tests/inspector/elements-test.js

 var initialize_ElementTest = function() {
 
 InspectorTest.preloadPanel("elements");
 
 InspectorTest.inlineStyleSection = function()
 {
     return WebInspector.panels.elements.sidebarPanes.styles._sectionBlocks[0].sections[0];
 }
 
 InspectorTest.computedStyleWidget = function()
@@ skipping 337 matching lines @@
     }
 }
 
 InspectorTest.dumpSelectedElementStyles = function(excludeComputed, excludeMatched, omitLonghands, includeSelectorGroupMarks)
 {
     var sectionBlocks = WebInspector.panels.elements.sidebarPanes.styles._sectionBlocks;
     if (!excludeComputed)
         InspectorTest.dumpComputedStyle();
     for (var block of sectionBlocks) {
         for (var section of block.sections) {
-            if (section.rule() && excludeMatched)
+            if (section.style().parentRule && excludeMatched)
                 continue;
             if (section.element.previousSibling && section.element.previousSibling.className === "sidebar-separator") {
                 var nodeDescription = "";
                 if (section.element.previousSibling.firstElementChild)
                     nodeDescription = section.element.previousSibling.firstElementChild.shadowRoot.lastChild.textContent;
                 InspectorTest.addResult("======== " + section.element.previousSibling.textContent + nodeDescription + " ========");
             }
             printStyleSection(section, omitLonghands, includeSelectorGroupMarks);
         }
     }
@@ skipping 601 matching lines @@
             for (var ui of nodeRow.animations) {
                 InspectorTest.addResult(ui.animation().type());
                 InspectorTest.addResult(ui._nameElement.outerHTML);
                 InspectorTest.addResult(ui._svg.outerHTML);
             }
         }
     }
 }
 
 };