[iOS] Disables Done Button when Close All Tabs Confirmation is displayed

This CL updates the behavior of the Done button according to the other
buttons on the top Toolbar.

Bug: 1140518
Change-Id: I9e34024c4826a47fb9547ba3d0966f50596fbd1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2512917Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Ewann Pellé <ewannpv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823975}

ios/chrome/browser/ui/tab_grid/tab_grid_view_controller.mm

@@ -946,7 +946,10 @@ NSUInteger GetPageIndexFromPage(TabGridPage page) {
     NOTREACHED() << "The done button should not be configured based on the "
                     "contents of the recent tabs page.";
   }
-  self.doneButton.enabled = !gridViewController.gridEmpty;
+  // The Done button should have the same behavior as the other buttons on the
+  // top Toolbar.
+  self.doneButton.enabled = !gridViewController.gridEmpty &&
+                            self.topToolbar.pageControl.userInteractionEnabled;
 }
 
 - (void)configureCloseAllButtonForCurrentPageAndUndoAvailability {