Omnibox Test: Fix noisy mock in OmniboxEditTests

components/omnibox/browser/omnibox_edit_unittest.cc

Index: components/omnibox/browser/omnibox_edit_unittest.cc
diff --git a/components/omnibox/browser/omnibox_edit_unittest.cc b/components/omnibox/browser/omnibox_edit_unittest.cc
index c44e69bdf6b11a7bd98b8f6ae0a6a815965911b5..73323e5af1415a1bc44fafc6c9569279ae360cd3 100644
--- a/components/omnibox/browser/omnibox_edit_unittest.cc
+++ b/components/omnibox/browser/omnibox_edit_unittest.cc
@@ -185,7 +185,7 @@ TestingOmniboxClient::~TestingOmniboxClient() {
 std::unique_ptr<AutocompleteProviderClient>
 TestingOmniboxClient::CreateAutocompleteProviderClient() {
   std::unique_ptr<MockAutocompleteProviderClient> provider_client(
-      new MockAutocompleteProviderClient());
+      new testing::NiceMock<MockAutocompleteProviderClient>());
   EXPECT_CALL(*provider_client.get(), GetBuiltinURLs())
       .WillRepeatedly(testing::Return(std::vector<base::string16>()));
   EXPECT_CALL(*provider_client.get(), GetSchemeClassifier())