Bug 1540062 - Get rid of nsIPlaintextEditor.setWrapColumn. r=masayuki

No one (m-c, c-c and bluegriffon) uses nsIPlaintextEditor.setWrapColumn from
script. It is used from C++ only.

Differential Revision: https://phabricator.services.mozilla.com/D25363

editor/libeditor/TextEditor.cpp

@@ -1597,12 +1597,6 @@ TextEditor::SetWrapWidth(int32_t aWrapColumn) {
                               true);
 }
 
-NS_IMETHODIMP
-TextEditor::SetWrapColumn(int32_t aWrapColumn) {
-  mWrapColumn = aWrapColumn;
-  return NS_OK;
-}
-
 NS_IMETHODIMP
 TextEditor::GetNewlineHandling(int32_t* aNewlineHandling) {
   NS_ENSURE_ARG_POINTER(aNewlineHandling);

editor/libeditor/TextEditor.h

@@ -247,6 +247,14 @@ class TextEditor : public EditorBase, public nsIPlaintextEditor {
     return NS_OK;
   }
 
+  /**
+   * Similar to the setter for wrapWidth, but just sets the editor
+   * internal state without actually changing the content being edited
+   * to wrap at that column.  This should only be used by callers who
+   * are sure that their content is already set up correctly.
+   */
+  void SetWrapColumn(int32_t aWrapColumn) { mWrapColumn = aWrapColumn; }
+
  protected:  // May be called by friends.
   /****************************************************************************
    * Some classes like TextEditRules, HTMLEditRules, WSRunObject which are

editor/nsIPlaintextEditor.idl

@@ -72,14 +72,6 @@ interface nsIPlaintextEditor : nsISupports
     */
   attribute long wrapWidth;
 
-  /**
-   * Similar to the setter for wrapWidth, but just sets the editor
-   * internal state without actually changing the content being edited
-   * to wrap at that column.  This should only be used by callers who
-   * are sure that their content is already set up correctly.
-   */
-  void setWrapColumn(in long aWrapColumn);
-
   /** Get and set newline handling.
    *
    *  Values are the constants defined above.