Reapply 169371 "DevTools: defer styles delta calculation to until the end of the task"

LayoutTests/inspector/elements/styles/styles-test.js

Index: LayoutTests/inspector/elements/styles/styles-test.js
diff --git a/LayoutTests/inspector/elements/styles/styles-test.js b/LayoutTests/inspector/elements/styles/styles-test.js
index 4483c6cf721f3770a7a126023243976ecf87119c..a0fd9f14f5427df27acd15e90ed7853bb603645c 100644
--- a/LayoutTests/inspector/elements/styles/styles-test.js
+++ b/LayoutTests/inspector/elements/styles/styles-test.js
@@ -3,18 +3,8 @@ function initialize_StylesTests()
 
 InspectorTest.waitForStylesheetsOnFrontend = function(styleSheetsCount, callback)
 {
-    function styleSheetComparator(a, b)
-    {
-        if (a.sourceURL < b.sourceURL)
-            return -1;
-        else if (a.sourceURL > b.sourceURL)
-            return 1;
-        return a.startLine - b.startLine || a.startColumn - b.startColumn;
-    }
-
     var styleSheets = WebInspector.cssModel.allStyleSheets();
     if (styleSheets.length >= styleSheetsCount) {
-        styleSheets.sort(styleSheetComparator);
         callback(styleSheets);
         return;
     }