Site Settings Desktop: Implement USB devices section.

chrome/browser/ui/webui/settings/site_settings_handler.h

Index: chrome/browser/ui/webui/settings/site_settings_handler.h
diff --git a/chrome/browser/ui/webui/settings/site_settings_handler.h b/chrome/browser/ui/webui/settings/site_settings_handler.h
index 4442c50a79f8d5462fe0180e4ea92a29245066c5..5025c376c5c402529ad2223084ac608a405af688 100644
--- a/chrome/browser/ui/webui/settings/site_settings_handler.h
+++ b/chrome/browser/ui/webui/settings/site_settings_handler.h
@@ -33,6 +33,7 @@ class SiteSettingsHandler : public SettingsPageUIHandler,
   void OnJavascriptAllowed() override;
   void OnJavascriptDisallowed() override;
 
+  // Usage info.
   void OnGetUsageInfo(const storage::UsageInfoEntries& entries);
   void OnUsageInfoCleared(storage::QuotaStatusCode code);
 
@@ -54,6 +55,12 @@ class SiteSettingsHandler : public SettingsPageUIHandler,
   // Deletes the storage being used for a given host.
   void HandleClearUsage(const base::ListValue* args);
 
+  // Handles the request for a list of all USB devices.
+  void HandleFetchUsbDevices(const base::ListValue* args);
+
+  // Removes a particular USB device permission.
+  void HandleRemoveUsbDevice(const base::ListValue* args);
+
   // Gets and sets the default value for a particular content settings type.
   void HandleSetDefaultValueForContentType(const base::ListValue* args);
   void HandleGetDefaultValueForContentType(const base::ListValue* args);