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//chrome/browser/supervised_user.

This CL was uploaded by git cl split.

R=pam@chromium.org

Bug: 809610
Change-Id: I702004601120d3c855ec3a1b1670358ee9b57fa8
Reviewed-on: https://chromium-review.googlesource.com/c/1297414Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602379}

chrome/browser/supervised_user/child_accounts/child_account_service_unittest.cc

@@ -31,9 +31,10 @@ class ChildAccountServiceTest : public ::testing::Test {
   void SetUp() override {
     TestingProfile::Builder builder;
     builder.AddTestingFactory(ChromeSigninClientFactory::GetInstance(),
-                              BuildTestSigninClient);
-    builder.AddTestingFactory(GaiaCookieManagerServiceFactory::GetInstance(),
-                              BuildFakeGaiaCookieManagerService);
+                              base::BindRepeating(&BuildTestSigninClient));
+    builder.AddTestingFactory(
+        GaiaCookieManagerServiceFactory::GetInstance(),
+        base::BindRepeating(&BuildFakeGaiaCookieManagerService));
     profile_ = builder.Build();
     gaia_cookie_manager_service_ = static_cast<FakeGaiaCookieManagerService*>(
         GaiaCookieManagerServiceFactory::GetForProfile(profile_.get()));