Revert "Disable unit tests using --gtest-filter instead of at compile time (flutter#16472)"

This reverts commit ed95cfa.

Author: NoamDev

fml/BUILD.gn

@@ -230,14 +230,9 @@ executable("fml_unittests") {
   sources = [
     "base32_unittest.cc",
     "command_line_unittest.cc",
-    "file_unittest.cc",
     "gpu_thread_merger_unittests.cc",
     "memory/ref_counted_unittest.cc",
     "memory/weak_ptr_unittest.cc",
-    "message_loop_task_queues_merge_unmerge_unittests.cc",
-    "message_loop_task_queues_unittests.cc",
-    "message_loop_unittests.cc",
-    "message_unittests.cc",
     "paths_unittests.cc",
     "platform/darwin/string_range_sanitization_unittests.mm",
     "synchronization/count_down_latch_unittests.cc",
@@ -251,6 +246,23 @@ executable("fml_unittests") {
     "time/time_unittest.cc",
   ]
 
+  # TODO(https://github.com/flutter/flutter/issues/50032) Enable after the
+  # Fuchsia message loop migration is complete.
+  if (!is_fuchsia) {
+    sources += [
+      "message_loop_task_queues_merge_unmerge_unittests.cc",
+      "message_loop_task_queues_unittests.cc",
+      "message_loop_unittests.cc",
+      "message_unittests.cc",
+    ]
+  }
+
+  # TODO(https://github.com/flutter/flutter/issues/50031):
+  # Figure out why these tests don't work currently on Fuchsia
+  if (!is_fuchsia) {
+    sources += [ "file_unittest.cc" ]
+  }
+
   deps = [
     ":fml_fixtures",
     "//flutter/fml",

testing/fuchsia/run_tests.sh

@@ -49,12 +49,9 @@ done
     -f flutter_runner_scenic_tests-0.far  \
     -t flutter_runner_scenic_tests
 
-# TODO(https://github.com/flutter/flutter/issues/50032) Enable after the
-# Fuchsia message loop migration is complete.
 ./fuchsia_ctl -d $device_name test \
     -f fml_tests-0.far  \
-    -t fml_tests \
-    -a "--gtest_filter=-MessageLoop*:Message*:FileTest*"
+    -t fml_tests
 
 ./fuchsia_ctl -d $device_name test \
     -f flow_tests-0.far  \