[Settings]: Remove unused showMultidevice bindings

None of settings-main, settings-menu, os-settings-main, and
os-settings-menu have a showMultidevice property so this CL removes an
unused binding to the undefined showMultidevice_ properties of
setting-ui and os-settings-ui.

Bug: 983274
Change-Id: I9d7489c48e10bdfe50d3d0fa36ff815edeebc0ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1698861Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: May Lippert <maybelle@chromium.org>
Commit-Queue: Jordy Greenblatt <jordynass@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676660}

chrome/browser/resources/settings/chromeos/os_settings_ui/os_settings_ui.html

@@ -126,7 +126,6 @@
               show-crostini="[[showCrostini_]]"
               show-parental-controls="[[showParentalControls_]]"
               show-plugin-vm="[[showPluginVm_]]"
-              show-multidevice="[[showMultidevice_]]"
               have-play-store-app="[[havePlayStoreApp_]]"
               on-iron-activate="onIronActivate_"
               advanced-opened="{{advancedOpenedInMenu_}}">
@@ -142,7 +141,6 @@
             show-assistant="[[showAssistant_]]"
             show-crostini="[[showCrostini_]]"
             show-plugin-vm="[[showPluginVm_]]"
-            show-multidevice="[[showMultidevice_]]"
             have-play-store-app="[[havePlayStoreApp_]]"
             on-iron-activate="onIronActivate_"
             advanced-opened="{{advancedOpenedInMenu_}}">
@@ -157,7 +155,6 @@
           show-crostini="[[showCrostini_]]"
           show-parental-controls="[[showParentalControls_]]"
           show-plugin-vm="[[showPluginVm_]]"
-          show-multidevice="[[showMultidevice_]]"
           have-play-store-app="[[havePlayStoreApp_]]"
           advanced-toggle-expanded="{{advancedOpenedInMain_}}">
       </os-settings-main>

chrome/browser/resources/settings/settings_ui/settings_ui.html

@@ -131,7 +131,6 @@
               show-crostini="[[showCrostini_]]"
               show-parental-controls="[[showParentalControls_]]"
               show-plugin-vm="[[showPluginVm_]]"
-              show-multidevice="[[showMultidevice_]]"
               have-play-store-app="[[havePlayStoreApp_]]"
               on-iron-activate="onIronActivate_"
               advanced-opened="{{advancedOpenedInMenu_}}">
@@ -147,7 +146,6 @@
             show-crostini="[[showCrostini_]]"
             show-parental-controls="[[showParentalControls_]]"
             show-plugin-vm="[[showPluginVm_]]"
-            show-multidevice="[[showMultidevice_]]"
             have-play-store-app="[[havePlayStoreApp_]]"
             on-iron-activate="onIronActivate_"
             advanced-opened="{{advancedOpenedInMenu_}}">
@@ -161,7 +159,6 @@
           show-crostini="[[showCrostini_]]"
           show-parental-controls="[[showParentalControls_]]"
           show-plugin-vm="[[showPluginVm_]]"
-          show-multidevice="[[showMultidevice_]]"
           have-play-store-app="[[havePlayStoreApp_]]"
           advanced-toggle-expanded="{{advancedOpenedInMain_}}">
       </settings-main>