Use ScopedTaskEnvironment instead of MessageLoop in components unit tests.

components/omnibox/browser/history_quick_provider_performance_unittest.cc

Index: components/omnibox/browser/history_quick_provider_performance_unittest.cc
diff --git a/components/omnibox/browser/history_quick_provider_performance_unittest.cc b/components/omnibox/browser/history_quick_provider_performance_unittest.cc
index f15f3059e268bd5f88471c974f93a1afe9568c38..f9138d496ea337f6637a18a9560153822cee3f16 100644
--- a/components/omnibox/browser/history_quick_provider_performance_unittest.cc
+++ b/components/omnibox/browser/history_quick_provider_performance_unittest.cc
@@ -11,6 +11,7 @@
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/test/scoped_task_environment.h"
 #include "components/history/core/browser/history_backend.h"
 #include "components/history/core/browser/history_database.h"
 #include "components/history/core/browser/history_service.h"
@@ -97,7 +98,7 @@ class HQPPerfTestOnePopularURL : public testing::Test {
  private:
   base::TimeDelta RunTest(const base::string16& text);
 
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   std::unique_ptr<FakeAutocompleteProviderClient> client_;
 
   scoped_refptr<HistoryQuickProvider> provider_;