Bug 1640019 - Part 7: Remove the unused 'navigateAndRestoreByIndex' m…

…ethod, r=Gijs

This method was used by GroupedSHistory for prerendering, and was missed when we
ripped out the incomplete code.

Differential Revision: https://phabricator.services.mozilla.com/D78975

browser/base/content/browser.js

@@ -5494,22 +5494,6 @@ var XULBrowserWindow = {
     }
     this.onStatusChange(gBrowser.webProgress, null, 0, aMessage);
   },
-
-  navigateAndRestoreByIndex: function XWB_navigateAndRestoreByIndex(
-    aBrowser,
-    aIndex
-  ) {
-    let tab = gBrowser.getTabForBrowser(aBrowser);
-    if (tab) {
-      SessionStore.navigateAndRestore(tab, {}, aIndex);
-      return;
-    }
-
-    throw new Error(
-      "Trying to navigateAndRestore a browser which was " +
-        "not attached to this tabbrowser is unsupported"
-    );
-  },
 };
 
 var LinkTargetDisplay = {

xpfe/appshell/nsIXULBrowserWindow.idl

@@ -78,13 +78,5 @@ interface nsIXULBrowserWindow : nsISupports
    * Return the number of tabs in this window.
    */
   uint32_t getTabCount();
-
-  /**
-   * Navigate the browser to the given history index after restoring the full history
-   * from SessionStore. If the browser is currently in GroupedSHistory mode, it will
-   * be reverted to a non-grouped history mode. If a process change is required to
-   * perform the load, this will also occur.
-   */
-  void navigateAndRestoreByIndex(in nsIBrowser aBrowser, in long aIndex);
 };