EDK: Move mutex.*, cond_var.*, and thread_annotations.h to //mojo/edk/util.

mojo/edk/system/BUILD.gn

Index: mojo/edk/system/BUILD.gn
diff --git a/mojo/edk/system/BUILD.gn b/mojo/edk/system/BUILD.gn
index 14c7bf89f553d681bdf6487f092bbbb7a9d1905c..b6461a2ded65561150018106c2d7ae677cf8bbf1 100644
--- a/mojo/edk/system/BUILD.gn
+++ b/mojo/edk/system/BUILD.gn
@@ -33,8 +33,6 @@ component("system") {
     "channel_id.h",
     "channel_manager.cc",
     "channel_manager.h",
-    "cond_var.cc",
-    "cond_var.h",
     "configuration.cc",
     "configuration.h",
     "connection_identifier.h",
@@ -82,8 +80,6 @@ component("system") {
     "message_pipe_dispatcher.h",
     "message_pipe_endpoint.cc",
     "message_pipe_endpoint.h",
-    "mutex.cc",
-    "mutex.h",
     "options_validation.h",
     "platform_handle_dispatcher.cc",
     "platform_handle_dispatcher.h",
@@ -104,7 +100,6 @@ component("system") {
     "simple_dispatcher.h",
     "slave_connection_manager.cc",
     "slave_connection_manager.h",
-    "thread_annotations.h",
     "transport_data.cc",
     "transport_data.h",
     "unique_identifier.cc",
@@ -152,7 +147,6 @@ test("mojo_system_unittests") {
     "channel_test_base.cc",
     "channel_test_base.h",
     "channel_unittest.cc",
-    "cond_var_unittest.cc",
     "connection_manager_unittest.cc",
     "core_test_base.cc",
     "core_test_base.h",
@@ -171,7 +165,6 @@ test("mojo_system_unittests") {
     "message_pipe_test_utils.h",
     "message_pipe_unittest.cc",
     "multiprocess_message_pipe_unittest.cc",
-    "mutex_unittest.cc",
     "options_validation_unittest.cc",
     "platform_handle_dispatcher_unittest.cc",
     "raw_channel_unittest.cc",
@@ -181,7 +174,6 @@ test("mojo_system_unittests") {
     "simple_dispatcher_unittest.cc",
     "test_channel_endpoint_client.cc",
     "test_channel_endpoint_client.h",
-    "thread_annotations_unittest.cc",
     "unique_identifier_unittest.cc",
     "waitable_event_unittest.cc",
     "waiter_test_utils.cc",