Refactor ProtectedMediaIdentifierPermissionContext to derive from PermissionContextBase.

chrome/browser/media/protected_media_identifier_permission_context_factory.cc

Index: chrome/browser/media/protected_media_identifier_permission_context_factory.cc
diff --git a/chrome/browser/media/protected_media_identifier_permission_context_factory.cc b/chrome/browser/media/protected_media_identifier_permission_context_factory.cc
index a87baa8250e74ed59e0633c3743918acd77c9523..73e721e854fea57273a13d11dc933e573d260498 100644
--- a/chrome/browser/media/protected_media_identifier_permission_context_factory.cc
+++ b/chrome/browser/media/protected_media_identifier_permission_context_factory.cc
@@ -9,39 +9,14 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
-#include "components/keyed_service/core/keyed_service.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 
-namespace {
-
-class Service : public KeyedService {
- public:
-  explicit Service(Profile* profile) {
-    context_ = new ProtectedMediaIdentifierPermissionContext(profile);
-  }
-
-  ProtectedMediaIdentifierPermissionContext* context() {
-    return context_.get();
-  }
-
-  virtual void Shutdown() override {
-    context()->ShutdownOnUIThread();
-  }
-
- private:
-  scoped_refptr<ProtectedMediaIdentifierPermissionContext> context_;
-
-  DISALLOW_COPY_AND_ASSIGN(Service);
-};
-
-}  // namespace
-
 // static
 ProtectedMediaIdentifierPermissionContext*
 ProtectedMediaIdentifierPermissionContextFactory::GetForProfile(
     Profile* profile) {
-  return static_cast<Service*>(
-      GetInstance()->GetServiceForBrowserContext(profile, true))->context();
+  return static_cast<ProtectedMediaIdentifierPermissionContext*>(
+      GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
@@ -65,7 +40,8 @@ ProtectedMediaIdentifierPermissionContextFactory::
 KeyedService*
 ProtectedMediaIdentifierPermissionContextFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
-  return new Service(static_cast<Profile*>(profile));
+  return new ProtectedMediaIdentifierPermissionContext(
+      static_cast<Profile*>(profile));
 }
 
 void