Enable MSVC warning for unused locals.

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 be9c240b432213b36e54cc8cfdf43383aa29d286..18191f16692049ef9096e4d016cb3c7e9391a0de 100644
--- a/chrome/browser/search/hotword_service_unittest.cc
+++ b/chrome/browser/search/hotword_service_unittest.cc
@@ -117,13 +117,10 @@ TEST_P(HotwordServiceTest, IsHotwordAllowedBadFieldTrial) {
   TestingProfile::Builder profile_builder;
   scoped_ptr<TestingProfile> profile = profile_builder.Build();
 
-  HotwordServiceFactory* hotword_service_factory =
-      HotwordServiceFactory::GetInstance();
-
   // Check that the service exists so that a NULL service be ruled out in
   // following tests.
   HotwordService* hotword_service =
-      hotword_service_factory->GetForProfile(profile.get());
+      HotwordServiceFactory::GetInstance()->GetForProfile(profile.get());
   EXPECT_TRUE(hotword_service != NULL);
 
   // When the field trial is empty or Disabled, it should not be allowed.
@@ -154,13 +151,10 @@ TEST_P(HotwordServiceTest, IsHotwordAllowedLocale) {
   TestingProfile::Builder profile_builder;
   scoped_ptr<TestingProfile> profile = profile_builder.Build();
 
-  HotwordServiceFactory* hotword_service_factory =
-      HotwordServiceFactory::GetInstance();
-
   // Check that the service exists so that a NULL service be ruled out in
   // following tests.
   HotwordService* hotword_service =
-      hotword_service_factory->GetForProfile(profile.get());
+      HotwordServiceFactory::GetInstance()->GetForProfile(profile.get());
   EXPECT_TRUE(hotword_service != NULL);
 
   // Set the field trial to a valid one.
@@ -194,10 +188,8 @@ TEST_P(HotwordServiceTest, AudioLoggingPrefSetCorrectly) {
   TestingProfile::Builder profile_builder;
   scoped_ptr<TestingProfile> profile = profile_builder.Build();
 
-  HotwordServiceFactory* hotword_service_factory =
-      HotwordServiceFactory::GetInstance();
   HotwordService* hotword_service =
-      hotword_service_factory->GetForProfile(profile.get());
+      HotwordServiceFactory::GetInstance()->GetForProfile(profile.get());
   EXPECT_TRUE(hotword_service != NULL);
 
   // If it's a fresh profile, although the default value is true,