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/browser/api/display_source.

This CL was uploaded by git cl split.

R=alexander.shalamov@intel.com

Bug: 809610
Change-Id: I0296a88846eed33c92d7baa74217e845218f3bf5
Reviewed-on: https://chromium-review.googlesource.com/c/1257937Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601638}

extensions/browser/api/display_source/display_source_apitestbase.cc

@@ -8,6 +8,7 @@
 #include <map>
 #include <utility>
 
+#include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/task/post_task.h"
 #include "content/public/browser/browser_task_traits.h"
@@ -161,7 +162,7 @@ void AdaptMessagePattern(std::size_t key_pos,
 
 void InitMockDisplaySourceConnectionDelegate(content::BrowserContext* profile) {
   DisplaySourceConnectionDelegateFactory::GetInstance()->SetTestingFactory(
-    profile, &CreateMockDelegate);
+      profile, base::BindRepeating(&CreateMockDelegate));
 }
 namespace {