Bug 1664411 - Factor out a condition to unconditionally enable clipboard events in some documents. r=masayuki

This patch shouldn't introduce any behavior change.

Differential Revision: https://phabricator.services.mozilla.com/D89834

editor/libeditor/TextEditorDataTransfer.cpp

@@ -664,10 +664,7 @@ nsresult TextEditor::PasteTransferableAsAction(nsITransferable* aTransferable,
 }
 
 bool TextEditor::CanPaste(int32_t aClipboardType) const {
-  // Always enable the paste command when inside of a HTML or XHTML document,
-  // but if the document is chrome, let it control it.
-  RefPtr<Document> doc = GetDocument();
-  if (doc && doc->IsHTMLOrXHTML() && !nsContentUtils::IsChromeDoc(doc)) {
+  if (AreClipboardCommandsUnconditionallyEnabled()) {
     return true;
   }