Use the DefaultSearchManager as the exclusive authority on DSE, ignoring Web Data.

chrome/browser/search/instant_unittest_base.cc

Index: chrome/browser/search/instant_unittest_base.cc
diff --git a/chrome/browser/search/instant_unittest_base.cc b/chrome/browser/search/instant_unittest_base.cc
index 629100934369a6e92fcf3a105e03a90b32ed1a68..c67dede1ba953c26647422bc026423aca01c22f2 100644
--- a/chrome/browser/search/instant_unittest_base.cc
+++ b/chrome/browser/search/instant_unittest_base.cc
@@ -87,11 +87,14 @@ bool InstantUnitTestBase::IsInstantServiceObserver(
   return instant_service_->observers_.HasObserver(observer);
 }
 
+void InstantUnitTestBase::CustomizeServiceFactories() {
+  TemplateURLServiceFactory::GetInstance()->SetTestingFactoryAndUse(
+      profile(), &TemplateURLServiceFactory::BuildInstanceFor);
+}
+
 void InstantUnitTestBase::SetUpHelper() {
   BrowserWithTestWindowTest::SetUp();
 
-  TemplateURLServiceFactory::GetInstance()->SetTestingFactoryAndUse(
-      profile(), &TemplateURLServiceFactory::BuildInstanceFor);
   template_url_service_ = TemplateURLServiceFactory::GetForProfile(profile());
   ui_test_utils::WaitForTemplateURLServiceToLoad(template_url_service_);