Make DeclarativeUserScriptManager non-shared between profiles.

extensions/browser/extension_system.h

Index: extensions/browser/extension_system.h
diff --git a/extensions/browser/extension_system.h b/extensions/browser/extension_system.h
index 400f45e866734c14dba9cbc4d9a25e95ed6b8306..087ef7056e918826ebe533c2a8d2ecd5db2b1573 100644
--- a/extensions/browser/extension_system.h
+++ b/extensions/browser/extension_system.h
@@ -30,7 +30,6 @@ class BrowserContext;
 namespace extensions {
 
 class ContentVerifier;
-class DeclarativeUserScriptManager;
 class ErrorConsole;
 class EventRouter;
 class Extension;
@@ -77,9 +76,6 @@ class ExtensionSystem : public KeyedService {
   // The SharedUserScriptMaster is created at startup.
   virtual SharedUserScriptMaster* shared_user_script_master() = 0;
 
-  // The DeclarativeUserScriptManager is created at startup.
-  virtual DeclarativeUserScriptManager* declarative_user_script_manager() = 0;
-
   // The StateStore is created at startup.
   virtual StateStore* state_store() = 0;