Bug 1469769 - Part 6: Replace non-failing NS_NOTREACHED with MOZ_ASSERT_UNREACHABLE. r=froydnj

This patch is an automatic replacement of s/NS_NOTREACHED/MOZ_ASSERT_UNREACHABLE/. Reindenting long lines and whitespace fixups follow in patch 6b.

MozReview-Commit-ID: 5UQVHElSpCr

dom/html/nsHTMLContentSink.cpp

@@ -84,7 +84,7 @@ nsGenericHTMLElement*
 NS_NewHTMLNOTUSEDElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
                          FromParser aFromParser)
 {
-  NS_NOTREACHED("The element ctor should never be called");
+  MOZ_ASSERT_UNREACHABLE("The element ctor should never be called");
   return nullptr;
 }