Disable protocol dropdowns for autoconf printers

- This change disables non ipp/ipps protocols for autoconf printers,
  since selecting one for an autoconf printer could put the user in
  a broken state.
- Since we will disable the make/model dropdown in the edit dialog for
  autoconf printers, we want to prevent users from selecting a protocol
  that would require users to select their own PPD make/model.

Bug: 947183
Test: End to end manual, browsertest
Change-Id: I0d46626113f98a128e05cc7b6d95678e6e9301cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1747148
Commit-Queue: jimmy gong <jimmyxgong@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688583}

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

@@ -65,16 +65,20 @@
                 <option value="ipps">
                   $i18n{printerProtocolIpps}
                 </option>
-                <option value="http">
+                <option value="http"
+                    disabled="[[isAutoconfPrinter_(pendingPrinter_.*)]]">
                   $i18n{printerProtocolHttp}
                 </option>
-                <option value="https">
+                <option value="https"
+                    disabled="[[isAutoconfPrinter_(pendingPrinter_.*)]]">
                   $i18n{printerProtocolHttps}
                 </option>
-                <option value="socket">
+                <option value="socket"
+                    disabled="[[isAutoconfPrinter_(pendingPrinter_.*)]]">
                   $i18n{printerProtocolAppSocket}
                 </option>
-                <option value="lpd">
+                <option value="lpd"
+                    disabled="[[isAutoconfPrinter_(pendingPrinter_.*)]]">
                   $i18n{printerProtocolLpd}
                 </option>
                 <option value="usb" disabled="[[networkProtocolActive_]]">