Bug 1770944 - Remove `nsGkAtoms::mozbrowser`. r=smaug

Depends on D175898

Differential Revision: https://phabricator.services.mozilla.com/D183229

layout/base/PositionedEventTargeting.cpp

@@ -249,18 +249,6 @@ static nsIContent* GetClickableAncestor(
       return content;
     }
 
-    // Bug 921928: we don't have access to the content of remote iframe.
-    // So fluffing won't go there. We do an optimistic assumption here:
-    // that the content of the remote iframe needs to be a target.
-    if (content->IsHTMLElement(nsGkAtoms::iframe) &&
-        content->AsElement()->AttrValueIs(kNameSpaceID_None,
-                                          nsGkAtoms::mozbrowser,
-                                          nsGkAtoms::_true, eIgnoreCase) &&
-        content->AsElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::remote,
-                                          nsGkAtoms::_true, eIgnoreCase)) {
-      return content;
-    }
-
     // See nsCSSFrameConstructor::FindXULTagData. This code is not
     // really intended to be used with XUL, though.
     if (content->IsAnyOfXULElements(

layout/base/RestyleManager.cpp

@@ -3450,11 +3450,8 @@ void RestyleManager::MaybeRestyleForNthOfState(ServoStyleSet& aStyleSet,
 
 static inline bool AttributeInfluencesOtherPseudoClassState(
     const Element& aElement, const nsAtom* aAttribute) {
-  // We must record some state for :-moz-browser-frame,
-  // :-moz-table-border-nonzero, and :-moz-select-list-box.
-  if (aAttribute == nsGkAtoms::mozbrowser) {
-    return aElement.IsAnyOfHTMLElements(nsGkAtoms::iframe, nsGkAtoms::frame);
-  }
+  // We must record some state for :-moz-table-border-nonzero and
+  // :-moz-select-list-box.
 
   if (aAttribute == nsGkAtoms::border) {
     return aElement.IsHTMLElement(nsGkAtoms::table);

xpcom/ds/StaticAtoms.py

@@ -206,7 +206,6 @@ STATIC_ATOMS = [
     Atom("box", "box"),
     Atom("br", "br"),
     Atom("browser", "browser"),
-    Atom("mozbrowser", "mozbrowser"),
     Atom("button", "button"),
     Atom("callTemplate", "call-template"),
     Atom("canvas", "canvas"),