[Cleanup] Used scoped pointers in KeyedServiceFactory's SetTestingFactory functions.

chrome/browser/search/hotword_service_unittest.cc

Index: chrome/browser/search/hotword_service_unittest.cc
diff --git a/chrome/browser/search/hotword_service_unittest.cc b/chrome/browser/search/hotword_service_unittest.cc
index 588706c1c186e7f410230b12f649a6b8853da2fb..3172d24a33ac250b7cb49d67b1d09ad2ad53e307 100644
--- a/chrome/browser/search/hotword_service_unittest.cc
+++ b/chrome/browser/search/hotword_service_unittest.cc
@@ -109,8 +109,10 @@ class MockHotwordService : public HotwordService {
   std::string extension_id_;
 };
 
-KeyedService* BuildMockHotwordService(content::BrowserContext* context) {
-  return new MockHotwordService(static_cast<Profile*>(context));
+scoped_ptr<KeyedService> BuildMockHotwordService(
+    content::BrowserContext* context) {
+  return make_scoped_ptr(
+      new MockHotwordService(static_cast<Profile*>(context)));
 }
 
 }  // namespace