Use ICU plural syntax in more place

extensions/browser/api/device_permissions_prompt.cc

Index: extensions/browser/api/device_permissions_prompt.cc
diff --git a/extensions/browser/api/device_permissions_prompt.cc b/extensions/browser/api/device_permissions_prompt.cc
index 66aff350a7b7afe20909e589f824753855bb7246..b2df4726b2591a0771d6c0f4e2c2e4efb1e0dc31 100644
--- a/extensions/browser/api/device_permissions_prompt.cc
+++ b/extensions/browser/api/device_permissions_prompt.cc
@@ -90,9 +90,8 @@ class UsbDevicePermissionsPrompt : public DevicePermissionsPrompt::Prompt,
   }
 
   base::string16 GetHeading() const override {
-    return l10n_util::GetStringUTF16(
-        multiple() ? IDS_USB_DEVICE_PERMISSIONS_PROMPT_TITLE_MULTIPLE
-                   : IDS_USB_DEVICE_PERMISSIONS_PROMPT_TITLE_SINGLE);
+    return l10n_util::GetPluralStringFUTF16(
+        IDS_HID_DEVICE_PERMISSIONS_PROMPT_TITLE, devices_.size());
   }
 
   void Dismissed() override {
@@ -205,9 +204,8 @@ class HidDevicePermissionsPrompt : public DevicePermissionsPrompt::Prompt,
   }
 
   base::string16 GetHeading() const override {
-    return l10n_util::GetStringUTF16(
-        multiple() ? IDS_HID_DEVICE_PERMISSIONS_PROMPT_TITLE_MULTIPLE
-                   : IDS_HID_DEVICE_PERMISSIONS_PROMPT_TITLE_SINGLE);
+    return l10n_util::GetPluralStringFUTF16(
+        IDS_USB_DEVICE_PERMISSIONS_PROMPT_TITLE, devices_.size());
   }
 
   void Dismissed() override {
@@ -305,6 +303,7 @@ void DevicePermissionsPrompt::Prompt::SetObserver(Observer* observer) {
 }
 
 base::string16 DevicePermissionsPrompt::Prompt::GetPromptMessage() const {
+  // TODO(jungshik): Consider using the ICU syntax once bug 481734 is fixed.
   return l10n_util::GetStringFUTF16(multiple_
                                         ? IDS_DEVICE_PERMISSIONS_PROMPT_MULTIPLE
                                         : IDS_DEVICE_PERMISSIONS_PROMPT_SINGLE,