Remove obsolete TODO

ios/chrome/browser/ui/browser_view_controller.mm

Index: ios/chrome/browser/ui/browser_view_controller.mm
diff --git a/ios/chrome/browser/ui/browser_view_controller.mm b/ios/chrome/browser/ui/browser_view_controller.mm
index 113c3f260c4522d7a3eb9e881a56fb0c0dfc688e..3509d68559ea10667cee4be52299d5c63aa0d3fc 100644
--- a/ios/chrome/browser/ui/browser_view_controller.mm
+++ b/ios/chrome/browser/ui/browser_view_controller.mm
@@ -3914,7 +3914,6 @@ class BrowserBookmarkModelBridge : public bookmarks::BookmarkModelObserver {
 
   switch (command) {
     case IDC_BACK:
-      // TODO(crbug.com/677160): Remove |canGoBack| check.
       if ([_model currentTab].canGoBack) {
         [[_model currentTab] goBack];
       }
@@ -3958,7 +3957,6 @@ class BrowserBookmarkModelBridge : public bookmarks::BookmarkModelObserver {
       [self searchFindInPage];
       break;
     case IDC_FORWARD:
-      // TODO(crbug.com/677160): Remove |canGoForward| check.
       if ([_model currentTab].canGoForward) {
         [[_model currentTab] goForward];
       }