Remove WebViewKey in rules registry.

extensions/browser/guest_view/web_view/web_view_guest.h

Index: extensions/browser/guest_view/web_view/web_view_guest.h
diff --git a/extensions/browser/guest_view/web_view/web_view_guest.h b/extensions/browser/guest_view/web_view/web_view_guest.h
index 31ca93e13aed2a8b086f149c177a7b92b23dd002..884b153d2aeabead9756c772ccdcf99ed5eae095 100644
--- a/extensions/browser/guest_view/web_view/web_view_guest.h
+++ b/extensions/browser/guest_view/web_view/web_view_guest.h
@@ -25,6 +25,7 @@ struct WebFindOptions;
 
 namespace extensions {
 
+class RulesRegistryService;
 class WebViewInternalFindFunction;
 
 // A WebViewGuest provides the browser-side implementation of the <webview> API
@@ -57,6 +58,16 @@ class WebViewGuest : public GuestView<WebViewGuest>,
 
   static const char Type[];
 
+  static void GenerateRulesRegistryID(
+      int embedder_process_id,
+      int webview_instance_id,
+      RulesRegistryService* rules_registry_service,
+      int* rules_registry_id);
+
+  static int GetEmbedderProcessID(int process_id);
+
+  static void RemoveRulesRegistryID(int rules_registry_id);
+
   // Request navigating the guest to the provided |src| URL.
   void NavigateGuest(const std::string& src, bool force_navigation);
 
@@ -236,6 +247,7 @@ class WebViewGuest : public GuestView<WebViewGuest>,
 
  private:
   friend class WebViewPermissionHelper;
+
   WebViewGuest(content::BrowserContext* browser_context,
                int guest_instance_id);