Remove obsolete TODO

BUG=677160
R=eugenebut@chromium.org,marq@chromium.org

Review-Url: https://codereview.chromium.org/2630733002
Cr-Commit-Position: refs/heads/master@{#443574}

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];
       }