Clean up ARC file system unit tests.

components/arc/BUILD.gn

Index: components/arc/BUILD.gn
diff --git a/components/arc/BUILD.gn b/components/arc/BUILD.gn
index 3967d01d47bb99dc8e011ac2cd3104b785f15a4f..1850c05242f2f8c2fd6f235c6f9bfcfca4d2e4f1 100644
--- a/components/arc/BUILD.gn
+++ b/components/arc/BUILD.gn
@@ -21,8 +21,6 @@ static_library("arc") {
     "clipboard/arc_clipboard_bridge.h",
     "crash_collector/arc_crash_collector_bridge.cc",
     "crash_collector/arc_crash_collector_bridge.h",
-    "file_system/arc_file_system_operation_runner.cc",
-    "file_system/arc_file_system_operation_runner.h",
     "ime/arc_ime_bridge.h",
     "ime/arc_ime_bridge_impl.cc",
     "ime/arc_ime_bridge_impl.h",
@@ -169,8 +167,6 @@ mojom("arc_bindings") {
 static_library("arc_test_support") {
   testonly = true
   sources = [
-    "file_system/test/fake_arc_file_system_operation_runner.cc",
-    "file_system/test/fake_arc_file_system_operation_runner.h",
     "test/fake_app_instance.cc",
     "test/fake_app_instance.h",
     "test/fake_arc_session.cc",
@@ -194,6 +190,7 @@ static_library("arc_test_support") {
   deps = [
     "//base",
     "//mojo/common:common_base",
+    "//mojo/edk/embedder:headers",
   ]
 }