Convert indirect uses of TestingFactoryFunction

TestingFactoryFunction is a simple function pointer. It is
deprecated in favor of TestingFactory which is a Callback<>.
Convert indirect uses by using base::BindRepeating() in all
invocation of SetTestingFactory/AddTestingFactory.

This converts uses in src//extensions.

This CL was uploaded by git cl split.

R=karandeepb@chromium.org

Bug: 809610
Change-Id: Id51b769ac4c45ca7a92330cb820397ac42f4392e
Reviewed-on: https://chromium-review.googlesource.com/c/1257934
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596636}

extensions/browser/lazy_background_task_queue_unittest.cc

@@ -105,7 +105,7 @@ class LazyBackgroundTaskQueueTest : public ExtensionsTest {
 
     process_manager_ = static_cast<TestProcessManager*>(
         ProcessManagerFactory::GetInstance()->SetTestingFactoryAndUse(
-            browser_context(), CreateTestProcessManager));
+            browser_context(), base::BindRepeating(&CreateTestProcessManager)));
   }
 
   void TearDown() override {

extensions/browser/test_event_router.h

@@ -77,10 +77,10 @@ T* CreateAndUseTestEventRouter(content::BrowserContext* context) {
                 "T must be derived from EventRouter");
   return static_cast<T*>(
       extensions::EventRouterFactory::GetInstance()->SetTestingFactoryAndUse(
-          context, [](content::BrowserContext* context) {
+          context, base::BindRepeating([](content::BrowserContext* context) {
             return static_cast<std::unique_ptr<KeyedService>>(
                 std::make_unique<T>(context));
-          }));
+          })));
 }
 
 }  // namespace extensions