Bug 1608071: part 1) Rename common ancestor to closest common inclusive ancestor around nsRange. r=smaug

It's more precise and enables one to reason more clearly about related
code.

Differential Revision: https://phabricator.services.mozilla.com/D59318

dom/base/Element.cpp

@@ -2695,7 +2695,7 @@ void Element::List(FILE* out, int32_t aIndent, const nsCString& aPrefix) const {
   fprintf(out, " state=[%llx]",
           static_cast<unsigned long long>(State().GetInternalValue()));
   fprintf(out, " flags=[%08x]", static_cast<unsigned int>(GetFlags()));
-  if (IsCommonAncestorForRangeInSelection()) {
+  if (IsClosestCommonInclusiveAncestorForRangeInSelection()) {
     const LinkedList<nsRange>* ranges = GetExistingCommonAncestorRanges();
     int32_t count = 0;
     if (ranges) {