Reduce buggy usage of the registry controlled domain service.

content/renderer/webpublicsuffixlist_impl.h

Index: content/renderer/webpublicsuffixlist_impl.h
diff --git a/content/renderer/webpublicsuffixlist_impl.h b/content/renderer/webpublicsuffixlist_impl.h
index 36970473dd9c4a639c054b227c60ca6c6a837feb..875b9ebbf2f3bfe64468de61eecf6e9287506bad 100644
--- a/content/renderer/webpublicsuffixlist_impl.h
+++ b/content/renderer/webpublicsuffixlist_impl.h
@@ -15,7 +15,7 @@ namespace content {
 class WebPublicSuffixListImpl : public blink::WebPublicSuffixList {
  public:
   // WebPublicSuffixList methods:
-  size_t getPublicSuffixLength(const blink::WebString& host) override;
+  size_t getPublicSuffixLength(const blink::WebString&) override;
   ~WebPublicSuffixListImpl() override;
 };