Remove WebViewKey in rules registry.

extensions/browser/api/web_request/web_request_api.h

Index: extensions/browser/api/web_request/web_request_api.h
diff --git a/extensions/browser/api/web_request/web_request_api.h b/extensions/browser/api/web_request/web_request_api.h
index f519409aa99a916406fba22da6abbc96deaa4e92..15706f7a9409c057c7097ba417590c507a509d18 100644
--- a/extensions/browser/api/web_request/web_request_api.h
+++ b/extensions/browser/api/web_request/web_request_api.h
@@ -173,7 +173,7 @@ class ExtensionWebRequestEventRouter
   // the rule registry for |browser_context|.
   void RegisterRulesRegistry(
       void* browser_context,
-      const extensions::RulesRegistry::WebViewKey& webview_key,
+      int rules_registry_id,
       scoped_refptr<extensions::WebRequestRulesRegistry> rules_registry);
 
   // Dispatches the OnBeforeRequest event to any extensions whose filters match
@@ -476,8 +476,7 @@ class ExtensionWebRequestEventRouter
 
   CallbacksForPageLoad callbacks_for_page_load_;
 
-  typedef std::pair<void*, extensions::RulesRegistry::WebViewKey>
-      RulesRegistryKey;
+  typedef std::pair<void*, int> RulesRegistryKey;
   // Maps each browser_context (and OTRBrowserContext) and a webview key to its
   // respective rules registry.
   std::map<RulesRegistryKey,