Bug 1466469 - Devirtialize nsIHTMLEditor.GetActiveEditingHost. r=masa…

…yuki

Since GetActiveEditingHost is noscript method, we should move this from
nsIHTMLEditor to HTMLEditor.

MozReview-Commit-ID: 3jLHSstixxk

editor/libeditor/HTMLEditor.h

@@ -287,6 +287,12 @@ class HTMLEditor final : public TextEditor
   already_AddRefed<Element>
   GetElementOrParentByTagName(const nsAString& aTagName, nsINode* aNode);
 
+  /**
+    * Get an active editor's editing host in DOM window.  If this editor isn't
+    * active in the DOM window, this returns NULL.
+    */
+  Element* GetActiveEditingHost();
+
 protected: // May be called by friends.
   /****************************************************************************
    * Some classes like TextEditRules, HTMLEditRules, WSRunObject which are

editor/nsIHTMLEditor.idl

@@ -466,11 +466,5 @@ interface nsIHTMLEditor : nsISupports
    * @return    true if CR in a paragraph creates a new paragraph
    */
   attribute boolean returnInParagraphCreatesNewParagraph;
-
-  /**
-   * Get an active editor's editing host in DOM window.  If this editor isn't
-   * active in the DOM window, this returns NULL.
-   */
-  [noscript, notxpcom] Element GetActiveEditingHost();
 };