Cleanup unused feature_list in file_system.

To unused feature_list_ variable (remaining from former clean ups) are
removed.

Change-Id: Id2213500f45bfd1a2907516281a4962ce3f15f4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881152Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Auto-Submit: Ramin Halavati <rhalavati@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709506}

storage/browser/file_system/obfuscated_file_util_unittest.cc

@@ -20,7 +20,6 @@
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "base/stl_util.h"
-#include "base/test/scoped_feature_list.h"
 #include "base/test/task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
@@ -803,7 +802,6 @@ class ObfuscatedFileUtilTest : public testing::Test,
   }
 
  protected:
-  base::test::ScopedFeatureList feature_list_;
   std::unique_ptr<leveldb::Env> incognito_leveldb_environment_;
   base::test::TaskEnvironment task_environment_;
   base::ScopedTempDir data_dir_;

storage/browser/file_system/quota/quota_backend_impl_unittest.cc

@@ -13,7 +13,6 @@
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
-#include "base/test/scoped_feature_list.h"
 #include "base/test/task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "storage/browser/file_system/file_system_usage_cache.h"
@@ -152,7 +151,6 @@ class QuotaBackendImplTest : public testing::Test,
     return path;
   }
 
-  base::test::ScopedFeatureList feature_list_;
   base::test::SingleThreadTaskEnvironment task_environment_;
   base::ScopedTempDir data_dir_;
   std::unique_ptr<leveldb::Env> in_memory_env_;