disable print option in ui

elements/viewer-pdf-toolbar/viewer-pdf-toolbar.html

@@ -43,11 +43,11 @@
               title$="{{strings.tooltipDownload}}">
           </paper-icon-button>
 
-          <paper-icon-button id="print" icon="cr:print"
+          <!--paper-icon-button id="print" icon="cr:print"
               on-click="print"
               aria-label$="{{strings.tooltipPrint}}"
               title$="{{strings.tooltipPrint}}">
-          </paper-icon-button>
+          </paper-icon-button-->
 
           <viewer-toolbar-dropdown id="bookmarks"
                                    hidden$="[[!bookmarks.length]]"