Make MediaFileUtil run on thread pool.

webkit/fileapi/sandbox_mount_point_provider_unittest.cc

Index: webkit/fileapi/sandbox_mount_point_provider_unittest.cc
diff --git a/webkit/fileapi/sandbox_mount_point_provider_unittest.cc b/webkit/fileapi/sandbox_mount_point_provider_unittest.cc
index 4c109bfbe5fe07d36a849b365832894bc204f083..6d6b4dff2a8fdcc2439dbf8605b66f6d50f8a889 100644
--- a/webkit/fileapi/sandbox_mount_point_provider_unittest.cc
+++ b/webkit/fileapi/sandbox_mount_point_provider_unittest.cc
@@ -22,6 +22,7 @@
 #include "webkit/fileapi/file_system_context.h"
 #include "webkit/fileapi/file_system_mount_point_provider.h"
 #include "webkit/fileapi/file_system_operation_context.h"
+#include "webkit/fileapi/file_system_task_runners.h"
 #include "webkit/fileapi/file_system_util.h"
 #include "webkit/fileapi/mock_file_system_options.h"
 #include "webkit/quota/mock_special_storage_policy.h"
@@ -142,8 +143,7 @@ class SandboxMountPointProviderMigrationTest : public testing::Test {
         new quota::MockSpecialStoragePolicy;
     special_storage_policy->SetAllUnlimited(true);
     file_system_context_ = new FileSystemContext(
-        base::MessageLoopProxy::current(),
-        base::MessageLoopProxy::current(),
+        FileSystemTaskRunners::CreateMockTaskRunners(),
         special_storage_policy,
         NULL,
         data_dir_.path(),