Break ConsentProvider classes into own file

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index 62d1895da8751eb7d1ff36903117298f5d60664e..e801e1bc7af513ec764e9f3eb262c6bcd429c6fd 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -4132,7 +4132,9 @@ test("unit_tests") {
       sources +=
           [ "../browser/extensions/external_registry_loader_win_unittest.cc" ]
     }
-    if (!is_chromeos) {
+    if (is_chromeos) {
+      sources += [ "../browser/extensions/api/file_system/consent_provider_unittest.cc" ]
+    } else {
       sources += [
         "../browser/extensions/api/messaging/native_message_process_host_unittest.cc",
         "../browser/extensions/api/messaging/native_messaging_host_manifest_unittest.cc",