Audit some Mac TODOs.

chrome/browser/ui/cocoa/download/download_item_controller.mm

 // Copyright (c) 2010 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/download/download_item_controller.h"
 
 #include "app/l10n_util_mac.h"
 #include "app/resource_bundle.h"
 #include "app/text_elider.h"
 #include "base/mac_util.h"
@@ skipping 218 matching lines @@
 
 - (void)remove {
   // We are deleted after this!
   [shelf_ remove:self];
 }
 
 - (void)updateVisibility:(id)sender {
   if ([[self view] window])
     [self updateTheme:[[[self view] window] themeProvider]];
 
-  // TODO(thakis): Make this prettier, by fading the items out or overlaying
-  // the partial visible one with a horizontal alpha gradient -- crbug.com/17830
   NSView* view = [self view];
   NSRect containerFrame = [[view superview] frame];
   [view setHidden:(NSMaxX([view frame]) > NSWidth(containerFrame))];
 }
 
 - (IBAction)handleButtonClick:(id)sender {
   NSEvent* event = [NSApp currentEvent];
   if ([event modifierFlags] & NSCommandKeyMask) {
     // Let cmd-click show the file in Finder, like e.g. in Safari and Spotlight.
     menuBridge_->ExecuteCommand(DownloadShelfContextMenuMac::SHOW_IN_FOLDER);
@@ skipping 138 matching lines @@
     [sender setTitle:l10n_util::GetNSStringWithFixup(
         IDS_DOWNLOAD_MENU_PAUSE_ITEM)];
   } else {
     [sender setTitle:l10n_util::GetNSStringWithFixup(
         IDS_DOWNLOAD_MENU_RESUME_ITEM)];
   }
   menuBridge_->ExecuteCommand(DownloadShelfContextMenuMac::TOGGLE_PAUSE);
 }
 
 @end