Bug 1727271: part 2) Update documentation of `RemotePermissionRequest`. r=edgar

"b2g" is an old term used in the context of Firefox OS, which was
discontinued a longer time ago.

Depends on D123428

Differential Revision: https://phabricator.services.mozilla.com/D123438

dom/base/nsContentPermissionHelper.h

@@ -179,7 +179,8 @@ class nsContentPermissionRequestProxy : public nsIContentPermissionRequest {
 };
 
 /**
- * RemotePermissionRequest will send a prompt ipdl request to b2g process.
+ * RemotePermissionRequest will send a prompt ipdl request to the chrome process
+ * (https://wiki.mozilla.org/Security/Sandbox/Process_model#Chrome_process_.28Parent.29).
  */
 class RemotePermissionRequest final
     : public mozilla::dom::PContentPermissionRequestChild {