Fix ExtensionServiceTest.ClearExtensionData flakiness

chrome/browser/ui/app_list/extension_app_model_builder_unittest.cc

Index: chrome/browser/ui/app_list/extension_app_model_builder_unittest.cc
diff --git a/chrome/browser/ui/app_list/extension_app_model_builder_unittest.cc b/chrome/browser/ui/app_list/extension_app_model_builder_unittest.cc
index b40c382dd3344c014cfaf6986f519b148c48e443..87e57c9a8b6895716bc917390f415ea1432323e4 100644
--- a/chrome/browser/ui/app_list/extension_app_model_builder_unittest.cc
+++ b/chrome/browser/ui/app_list/extension_app_model_builder_unittest.cc
@@ -206,8 +206,10 @@ TEST_F(ExtensionAppModelBuilderTest, DisableAndEnable) {
 }
 
 TEST_F(ExtensionAppModelBuilderTest, Uninstall) {
-  service_->UninstallExtension(
-      kPackagedApp2Id, extensions::UNINSTALL_REASON_FOR_TESTING, NULL);
+  service_->UninstallExtension(kPackagedApp2Id,
+                               extensions::UNINSTALL_REASON_FOR_TESTING,
+                               base::Bind(&base::DoNothing),
+                               NULL);
   EXPECT_EQ(std::string("Packaged App 1,Hosted App"),
             GetModelContent(model_.get()));
 
@@ -222,8 +224,10 @@ TEST_F(ExtensionAppModelBuilderTest, UninstallTerminatedApp) {
   // Simulate an app termination.
   service_->TrackTerminatedExtensionForTest(app);
 
-  service_->UninstallExtension(
-      kPackagedApp2Id, extensions::UNINSTALL_REASON_FOR_TESTING, NULL);
+  service_->UninstallExtension(kPackagedApp2Id,
+                               extensions::UNINSTALL_REASON_FOR_TESTING,
+                               base::Bind(&base::DoNothing),
+                               NULL);
   EXPECT_EQ(std::string("Packaged App 1,Hosted App"),
             GetModelContent(model_.get()));