Bug 1717156 - part 3: Get rid of nsIEditor::eEditorFilterInputMask …

…and its accessor r=m_kato

Nobody (including comm-central and BlueGriffon) uses
`nsIEditor::eEditorFilterInputMask`.  Therefore, we can get rid of this and its
accessor, `EditorBase::IsInputFiltered()`.

Differential Revision: https://phabricator.services.mozilla.com/D118263

editor/libeditor/EditorBase.h

@@ -584,10 +584,6 @@ class EditorBase : public nsIEditor,
     return (mFlags & nsIEditor::eEditorReadonlyMask) != 0;
   }
 
-  bool IsInputFiltered() const {
-    return (mFlags & nsIEditor::eEditorFilterInputMask) != 0;
-  }
-
   bool IsMailEditor() const {
     const bool isMailEditor = (mFlags & nsIEditor::eEditorMailMask) != 0;
     MOZ_ASSERT_IF(isMailEditor, IsHTMLEditor());

editor/nsIEditor.idl

@@ -64,8 +64,6 @@ interface nsIEditor  : nsISupports
   // this flag does not change the style of editor.  This just changes the
   // internal editor's readonly state.
   const long eEditorReadonlyMask        = 0x0008;
-  // text input is limited to certain character types, use mFilter
-  const long eEditorFilterInputMask     = 0x0010;
   // If you want an HTML editor to work as an email composer, specify this flag.
   // So, this is not available with text editor instances.
   const long eEditorMailMask            = 0x0020;