Missing call to base class RemovedFrom().

Introduced in:

https://crrev.com/bf7739c4947015b9ddfd245f28ea35de58fe45f8

Caused various fuzzer crashes.

R=andruud@chromium.org

Bug: 961535, 961520
Change-Id: I84fc226afb690fab5cbf07d7ca6aa9b79b4e2f16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1605406Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658514}

third_party/blink/renderer/core/html/html_meta_element.cc

@@ -531,6 +531,7 @@ void HTMLMetaElement::DidNotifySubtreeInsertionsToDocument() {
 }
 
 void HTMLMetaElement::RemovedFrom(ContainerNode& insertion_point) {
+  HTMLElement::RemovedFrom(insertion_point);
   const AtomicString& name_value = FastGetAttribute(kNameAttr);
   if (!name_value.IsEmpty())
     NameRemoved(name_value);