[Mac] Remove unnecessary subclasses in bookmark bar

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_view_cocoa.mm

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_bar_view_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_view_cocoa.mm b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_view_cocoa.mm
index eb1a0da06ebe12e0738607c2c49fab17830ed10d..cda5adee7b2472f17c9039eaab4a486d7b3fc971 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_view_cocoa.mm
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_view_cocoa.mm
@@ -113,7 +113,7 @@ using bookmarks::BookmarkNode;
   return NO;
 }
 
-- (BookmarkBarTextField*)noItemTextfield {
+- (NSTextField*)noItemTextfield {
   return noItemTextfield_;
 }
 
@@ -290,19 +290,3 @@ using bookmarks::BookmarkNode;
 }
 
 @end  // @implementation BookmarkBarView
-
-@implementation BookmarkBarTextField
-
-- (NSMenu*)menu {
-  return [barView_ menu];
-}
-
-@end  // @implementation BookmarkBarTextField
-
-@implementation BookmarkBarItemContainer
-
-- (NSMenu*)menu {
-  return [barView_ menu];
-}
-
-@end  // @implementation BookmarkBarItemContainer