DOM: Remove standard-violating optimizations in appendChild, insertBefore, and replaceChild.

third_party/WebKit/LayoutTests/external/wpt/dom/nodes/MutationObserver-childList-expected.txt

Index: third_party/WebKit/LayoutTests/external/wpt/dom/nodes/MutationObserver-childList-expected.txt
diff --git a/third_party/WebKit/LayoutTests/external/wpt/dom/nodes/MutationObserver-childList-expected.txt b/third_party/WebKit/LayoutTests/external/wpt/dom/nodes/MutationObserver-childList-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a889c6d55222135eafe301d2460a35e9cd8f2a98
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/dom/nodes/MutationObserver-childList-expected.txt
@@ -0,0 +1,41 @@
+This is a testharness.js-based test.
+PASS childList Node.nodeValue: no mutation 
+PASS childList Node.textContent: replace content mutation 
+PASS childList Node.textContent: no previous content mutation 
+PASS childList Node.textContent: textContent no mutation 
+PASS childList Node.textContent: empty string mutation 
+PASS childList Node.normalize mutation 
+PASS childList Node.normalize mutations 
+PASS childList Node.insertBefore: addition mutation 
+PASS childList Node.insertBefore: removal mutation 
+PASS childList Node.insertBefore: removal and addition mutations 
+PASS childList Node.insertBefore: fragment addition mutations 
+PASS childList Node.insertBefore: fragment removal mutations 
+PASS childList Node.insertBefore: last child addition mutation 
+PASS childList Node.appendChild: addition mutation 
+PASS childList Node.appendChild: removal mutation 
+PASS childList Node.appendChild: removal and addition mutations 
+PASS childList Node.appendChild: fragment addition mutations 
+PASS childList Node.appendChild: fragment removal mutations 
+PASS childList Node.appendChild: addition outside document tree mutation 
+PASS childList Node.replaceChild: replacement mutation 
+PASS childList Node.replaceChild: removal mutation 
+FAIL childList Node.replaceChild: internal replacement mutation assert_equals: mutation records must match expected 2 but got 1
+FAIL childList Node.replaceChild: self internal replacement mutation assert_equals: mutation records must match expected 2 but got 1
+PASS childList Node.removeChild: removal mutation 
+PASS Range (r70) is created 
+PASS childList Range.deleteContents: child removal mutation 
+PASS Range (r71) is created 
+PASS childList Range.deleteContents: child and data removal mutation 
+PASS Range (r80) is created 
+PASS childList Range.extractContents: child removal mutation 
+PASS Range (r81) is created 
+PASS childList Range.extractContents: child and data removal mutation 
+PASS Range (r90) is created 
+PASS childList Range.insertNode: child insertion mutation 
+PASS Range (r91) is created 
+PASS childList Range.insertNode: children insertion mutation 
+PASS Range (r100) is created 
+PASS childList Range.surroundContents: children removal and addition mutation 
+Harness: the test ran to completion.
+