Bookmark name inputs should only allow single-line input

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

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_name_folder_controller.h"
 
 #include "base/mac/mac_util.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/profiles/profile.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_cell_single_line.h"
@@ skipping 54 matching lines @@
                                node:nil
                              parent:parent
                            newIndex:newIndex];
 }
 
 - (void)awakeFromNib {
   [nameField_ setStringValue:initialName_.get()];
 
   // Check if NSTextFieldCell supports the method. This check is in place as
   // only 10.6 and greater support the setUsesSingleLineMode method.
+  // TODO(kushi.p): Remove this when the project hits a 10.6+ only state.
   NSTextFieldCell* nameFieldCell_ = [nameField_ cell];
   if ([nameFieldCell_
           respondsToSelector:@selector(setUsesSingleLineMode:)]) {
     [nameFieldCell_ setUsesSingleLineMode:YES];
   }
 }
 
 - (void)runAsModalSheet {
   // Ping me when things change out from under us.
   observer_.reset(new BookmarkModelObserverForCocoa(
@@ skipping 38 matching lines @@
 
 - (void)setFolderName:(NSString*)name {
   [nameField_ setStringValue:name];
 }
 
 - (NSButton*)okButton {
   return okButton_;
 }
 
 @end  // BookmarkNameFolderController