Fix HotwordServiceTest under ubsan: no more vcalls on garbage.

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 bff640f46d7abf48f7080e76afcf788d4c13a59e..fd8d5bfc06451ba3118ee29ad7ad3b117c75b624 100644
--- a/chrome/browser/search/hotword_service_unittest.cc
+++ b/chrome/browser/search/hotword_service_unittest.cc
@@ -234,6 +234,8 @@ TEST_P(HotwordServiceTest, ShouldReinstallExtension) {
 
   // Now it's a different locale so it should uninstall.
   EXPECT_TRUE(hotword_service->ShouldReinstallHotwordExtension());
+
+  base::MessageLoop::current()->RunUntilIdle();
 }
 
 TEST_P(HotwordServiceTest, PreviousLanguageSetOnInstall) {
@@ -452,6 +454,7 @@ TEST_P(HotwordServiceTest, IsAlwaysOnEnabled) {
   profile()->GetPrefs()->SetBoolean(prefs::kHotwordAlwaysOnSearchEnabled,
                                     false);
   EXPECT_FALSE(hotword_service->IsAlwaysOnEnabled());
+  base::MessageLoop::current()->RunUntilIdle();
 }
 
 TEST_P(HotwordServiceTest, IsSometimesOnEnabled) {
@@ -501,6 +504,7 @@ TEST_P(HotwordServiceTest, IsSometimesOnEnabled) {
   profile()->GetPrefs()->SetBoolean(prefs::kHotwordAlwaysOnSearchEnabled,
                                     false);
   EXPECT_FALSE(hotword_service->IsSometimesOnEnabled());
+  base::MessageLoop::current()->RunUntilIdle();
 }
 
 TEST_P(HotwordServiceTest, AudioHistorySyncOccurs) {
@@ -531,4 +535,5 @@ TEST_P(HotwordServiceTest, AudioHistorySyncOccurs) {
   EXPECT_EQ(2, audio_history_handler->GetAudioHistoryCalls());
   EXPECT_TRUE(test_task_runner->HasPendingTask());
   test_task_runner->ClearPendingTasks();
+  base::MessageLoop::current()->RunUntilIdle();
 }