Make AttachBehavior a required argument.

Source/core/html/HTMLMeterElement.cpp

Index: Source/core/html/HTMLMeterElement.cpp
diff --git a/Source/core/html/HTMLMeterElement.cpp b/Source/core/html/HTMLMeterElement.cpp
index 2359e8795036e1820573f5cda9c6e38b4bb0a2ad..c64d2abcbc717532f1b8c95e78c37510bc07d4d6 100644
--- a/Source/core/html/HTMLMeterElement.cpp
+++ b/Source/core/html/HTMLMeterElement.cpp
@@ -227,15 +227,15 @@ void HTMLMeterElement::didAddUserAgentShadowRoot(ShadowRoot* root)
     ASSERT(!m_value);
 
     RefPtr<MeterInnerElement> inner = MeterInnerElement::create(document());
-    root->appendChild(inner);
+    root->appendChild(inner, ASSERT_NO_EXCEPTION, DeprecatedAttachNow);
 
     RefPtr<MeterBarElement> bar = MeterBarElement::create(document());
     m_value = MeterValueElement::create(document());
     m_value->setWidthPercentage(0);
     m_value->updatePseudo();
-    bar->appendChild(m_value, ASSERT_NO_EXCEPTION);
+    bar->appendChild(m_value, ASSERT_NO_EXCEPTION, DeprecatedAttachNow);
 
-    inner->appendChild(bar, ASSERT_NO_EXCEPTION);
+    inner->appendChild(bar, ASSERT_NO_EXCEPTION, DeprecatedAttachNow);
 }
 
 } // namespace