DevTools: remove nesting depth tracking from coverage

third_party/WebKit/LayoutTests/inspector/coverage/gutter-css.html

Index: third_party/WebKit/LayoutTests/inspector/coverage/gutter-css.html
diff --git a/third_party/WebKit/LayoutTests/inspector/coverage/gutter-css.html b/third_party/WebKit/LayoutTests/inspector/coverage/gutter-css.html
index 4fba4b94db8c707aa952efc3db9396e64261d221..0e910cd205f160e68f3d001df973d428bb694ff5 100644
--- a/third_party/WebKit/LayoutTests/inspector/coverage/gutter-css.html
+++ b/third_party/WebKit/LayoutTests/inspector/coverage/gutter-css.html
@@ -16,11 +16,7 @@ async function test()
     InspectorTest.startCoverage();
     await InspectorTest.evaluateInPagePromise("performActions()");
     await InspectorTest.stopCoverage();
-    await InspectorTest.sourceDecorated("highlight-in-source.css");
-
-    var lines = Array.prototype.map.call(document.querySelectorAll(".text-editor-coverage-unused-marker"),
-                                         e => e.parentElement.previousSibling.textContent);
-    InspectorTest.addResult(lines);
+    await InspectorTest.dumpDecorations("highlight-in-source.css");
     InspectorTest.completeTest();
 }
 </script>