Use ICU plural syntax in more place

extensions/extensions_strings.grd

 <?xml version="1.0" encoding="utf-8"?>
 
 <!--
   Strings for the extensions module. Used mostly for low-level error messages.
   Where possible new strings should be kept in Chrome and the extensions module
   should return an error code, message flag, etc.
 -->
 
 <grit latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
@@ skipping 353 matching lines @@
       </message>
       <message name="IDS_DEVICE_NAME_WITH_UNKNOWN_PRODUCT_UNKNOWN_VENDOR_SERIAL" desc="String describing a device by its serial number when only numeric vendor and product IDs are available.">
         Unknown product <ph name="PRODUCT_ID">$1<ex>1234</ex></ph> from vendor <ph name="VENDOR_ID">$2<ex>abcd</ex></ph> (serial number <ph name="SERIAL_NUMBER">$3<ex>00001</ex></ph>)
       </message>
       <message name="IDS_DEVICE_PERMISSIONS_PROMPT_MULTIPLE" desc="Instructions asking the user to select one or more devices for use with an app.">
         The application "<ph name="APP_NAME">$1<ex>Chrome Dev Editor</ex></ph>" is requesting access to one or more of your devices.
       </message>
       <message name="IDS_DEVICE_PERMISSIONS_PROMPT_SINGLE" desc="Instructions asking the user to select one device for use with an app.">
         The application "<ph name="APP_NAME">$1<ex>Chrome Dev Editor</ex></ph>" is requesting access to one of your devices.
       </message>
-      <message name="IDS_HID_DEVICE_PERMISSIONS_PROMPT_TITLE_MULTIPLE" desc="Title of the HID device selection dialog when the app will accept one or more selected devices.">
+      <message name="IDS_HID_DEVICE_PERMISSIONS_PROMPT_TITLE" desc="Title of the HID device selection dialog when the app will accept one or more selected devices. If a langugage has a generic plural (larger than one), use that for all sub-messages other than '=1'. [ICU Syntax]">
         Select HID devices
+      {NUM_DEVICE, plural,
+      =1 {Select a HID device} other {Select HID devices}}
       </message>
-      <message name="IDS_HID_DEVICE_PERMISSIONS_PROMPT_TITLE_SINGLE" desc="Title of the HID device selection dialog when the app wants only one device selected.">
-        Select a HID device
-      </message>
-      <message name="IDS_USB_DEVICE_PERMISSIONS_PROMPT_TITLE_MULTIPLE" desc="Title of the USB device selection dialog when the app will accept one or more selected devices.">
-        Select USB devices
-      </message>
-      <message name="IDS_USB_DEVICE_PERMISSIONS_PROMPT_TITLE_SINGLE" desc="Title of the USB device selection dialog when the app wants only one device selected.">
-        Select a USB device
+      <message name="IDS_USB_DEVICE_PERMISSIONS_PROMPT_TITLE" desc="Title of the USB device selection dialog when the app will accept one or more selected devices. If a langugage has a generic plural (larger than one), use that for all sub-messages other than '=1'. [ICU Syntax]">
+      {NUM_DEVICE, plural,
+      =1 {Select a USB device} other {Select USB devices}}
       </message>
       <message name="IDS_EXTENSION_PROMPT_WARNING_NETWORKING_CONFIG" desc="Permission string for Networking Config API.">
         Configure network connections
       </message>
       <message name="IDS_EXTENSION_PROMPT_WARNING_NETWORKING_PRIVATE" desc="Permission string for Networking Private API.">
         Manage network connections
       </message>
       <message name="IDS_EXTENSION_PROMPT_WARNING_SERIAL" desc="Permission string for access to serial devices.">
         Access your serial devices
       </message>
@@ skipping 105 matching lines @@
       <!-- Utility process names. Please keep alphabetized. -->
       <message name="IDS_UTILITY_PROCESS_EXTENSION_UNPACKER_NAME" desc="The name of the utility process used for unpacking extensions.">
         Extension Unpacker
       </message>
       <message name="IDS_UTILITY_PROCESS_MANIFEST_PARSER_NAME" desc="The name of the utility process used for parsing extension manifests.">
         Extension Manifest Parser
       </message>
     </messages>
   </release>
 </grit>