TaskScheduler: migrate appcache database over to use it.

content/browser/appcache/appcache_host_unittest.cc

Index: content/browser/appcache/appcache_host_unittest.cc
diff --git a/content/browser/appcache/appcache_host_unittest.cc b/content/browser/appcache/appcache_host_unittest.cc
index 221afb21cdf7de18427c08a63a66c2b15cd75f54..16c3626eb9a670851bec327081637edbb2120650 100644
--- a/content/browser/appcache/appcache_host_unittest.cc
+++ b/content/browser/appcache/appcache_host_unittest.cc
@@ -10,7 +10,7 @@
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
-#include "base/message_loop/message_loop.h"
+#include "base/test/scoped_task_environment.h"
 #include "content/browser/appcache/appcache.h"
 #include "content/browser/appcache/appcache_backend_impl.h"
 #include "content/browser/appcache/appcache_group.h"
@@ -148,7 +148,7 @@ class AppCacheHostTest : public testing::Test {
     last_callback_param_ = param;
   }
 
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
 
   // Mock classes for the 'host' to work with
   MockAppCacheService service_;