Bookmark name inputs should only allow single-line input

chrome/browser/ui/cocoa/bookmarks/bookmark_bubble_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_bubble_controller.h"
 
 #include "base/mac/mac_util.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/bookmarks/bookmark_utils.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_button.h"
+#import "chrome/browser/ui/cocoa/bookmarks/bookmark_cell_single_line.h"
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #import "chrome/browser/ui/cocoa/info_bubble_view.h"
 #include "content/browser/user_metrics.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_service.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 
 
@@ skipping 77 matching lines @@
     // Watch to see if the parent window closes, and if so, close this one.
     NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
     [center addObserver:self
                selector:@selector(parentWindowWillClose:)
                    name:NSWindowWillCloseNotification
                  object:parentWindow_];
   }
   return self;
 }
 
+- (void)awakeFromNib {
+  // 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_ = [nameTextField_ cell];
+  if ([nameFieldCell_
+          respondsToSelector:@selector(setUsesSingleLineMode:)]) {
+    [nameFieldCell_ setUsesSingleLineMode:YES];
+  }
+}
+
 - (void)dealloc {
   [[NSNotificationCenter defaultCenter] removeObserver:self];
   [super dealloc];
 }
 
 // If this is a new bookmark somewhere visible (e.g. on the bookmark
 // bar), pulse it.  Else, call ourself recursively with our parent
 // until we find something visible to pulse.
 - (void)startPulsingBookmarkButton:(const BookmarkNode*)node  {
   while (node) {
@@ skipping 294 matching lines @@
   NSInteger idx = [menu indexOfItemWithRepresentedObject:parentValue];
   DCHECK(idx != -1);
   [folderPopUpButton_ selectItemAtIndex:idx];
 }
 
 - (NSPopUpButton*)folderPopUpButton {
   return folderPopUpButton_;
 }
 
 @end  // implementation BookmarkBubbleController(ExposedForUnitTesting)