Bug 1773070 - Unify Gecko and Servo EventState/ElementState bits. r=smaug

Add a dom/base/rust crate called just "dom" where we can share these.

Most of the changes are automatic:

  s/mozilla::EventStates/mozilla::dom::ElementState/
  s/EventStates/ElementState/
  s/NS_EVENT_STATE_/ElementState::/
  s/NS_DOCUMENT_STATE_/DocumentState::/

And so on. This requires a new cbindgen version to avoid ugly casts for
large shifts.

Differential Revision: https://phabricator.services.mozilla.com/D148537

layout/generic/nsTextFrame.cpp

@@ -118,7 +118,7 @@ static bool NeedsToMaskPassword(nsTextFrame* aFrame) {
       nsLayoutUtils::GetClosestFrameOfType(aFrame, LayoutFrameType::TextInput);
   MOZ_ASSERT(frame, "How do we have a masked text node without a text input?");
   return !frame || !frame->GetContent()->AsElement()->State().HasState(
-                       NS_EVENT_STATE_REVEALED);
+                       ElementState::REVEALED);
 }
 
 struct TabWidth {