Remove Nearby printer UI from settings.

chrome/browser/resources/settings/printing_page/cups_add_printer_dialog.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-spinner/paper-spinner.html">
 <link rel="import" href="/i18n_setup.html">
 <link rel="import" href="/md_select_css.html">
 <link rel="import" href="/printing_page/cups_add_printer_dialog_util.html">
 <link rel="import" href="/printing_page/cups_printers_browser_proxy.html">
 <link rel="import" href="/settings_shared_css.html">
 
@@ skipping 182 matching lines @@
         </div>
         <div class="search-printer-box printer-not-found"
             id="searchNotFound" hidden>
           <span>$i18n{printerNotFound}</span>
         </div>
         <div class="search-printer-box printer-found" id="searchFound" hidden>
           <span>$i18n{printerFound}</span>
         </div>
       </div>
       <div class="dialog-buttons">
-        <paper-button id="discoverPrintersButton"
-            on-tap="switchToDiscoveryDialog_">
-          $i18n{discoverPrintersButtonText}
-        </paper-button>
         <paper-button class="cancel-button" on-tap="onCancelTap_">
           $i18n{cancelButtonText}
         </paper-button>
         <paper-button class="action-button" on-tap="switchToConfiguringDialog_"
             disabled="[[!newPrinter.printerName]]">
           $i18n{addPrinterButtonText}
         </paper-button>
       </div>
     </add-printer-dialog>
   </template>
@@ skipping 155 matching lines @@
     <!-- Manufacturer and Model Dialog -->
     <template is="dom-if" if="[[showManufacturerDialog_]]" restamp>
       <add-printer-manufacturer-model-dialog new-printer="{{newPrinter}}"
           setup-failed="[[setupFailed]]">
       </add-printer-manufacturer-model-dialog>
     </template>
 
   </template>
   <script src="cups_add_printer_dialog.js"></script>
 </dom-module>