Fix a lot of support links.

chrome/browser/resources/chromeos/wallpaper_manager/js/wallpaper_manager.js

 // Copyright (c) 2013 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.
 
 /**
  * WallpaperManager constructor.
  *
  * WallpaperManager objects encapsulate the functionality of the wallpaper
  * manager extension.
  *
@@ skipping 17 matching lines @@
 }
 
 // Anonymous 'namespace'.
 // TODO(bshe): Get rid of anonymous namespace.
 (function() {
 
   /**
    * URL of the learn more page for wallpaper picker.
    */
   /** @const */ var LearnMoreURL =
-      'https://support.google.com/chromeos/?p=wallpaper_fileerror&hl=' +
+      'https://support.google.com/chromebook/?p=wallpaper_fileerror&hl=' +
           navigator.language;
 
   /**
    * Index of the All category. It is the first category in wallpaper picker.
    */
   /** @const */ var AllCategoryIndex = 0;
 
   /**
    * Index offset of categories parsed from manifest. The All category is added
    * before them. So the offset is 1.
@@ skipping 1058 matching lines @@
       }
       this.wallpaperGrid_.dataModel = wallpapersDataModel;
       if (selectedItem) {
         this.wallpaperGrid_.selectedItem = selectedItem;
         this.wallpaperGrid_.activeItem = selectedItem;
       }
     }
   };
 
 })();