Mojo C++ bindings: remove the utility/ folder.

BUG=570102

Review URL: https://codereview.chromium.org/1784643002

Cr-Original-Commit-Position: refs/heads/master@{#380472}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 5077fb33144bbc971146faefd960a671063b4321

all.gyp

@@ -57,7 +57,6 @@
             '../mojo/mojo_edk.gyp:mojo_system_impl',
             '../mojo/mojo_edk_tests.gyp:mojo_public_bindings_unittests',
             '../mojo/mojo_edk_tests.gyp:mojo_public_system_unittests',
-            '../mojo/mojo_edk_tests.gyp:mojo_public_utility_unittests',
             '../mojo/mojo_edk_tests.gyp:mojo_system_unittests',
             '../mojo/mojo_public.gyp:mojo_cpp_bindings',
             '../mojo/mojo_public.gyp:mojo_public_test_utils',

gn_migration.gypi

@@ -285,7 +285,6 @@
             '../mojo/mojo_edk_tests.gyp:mojo_public_bindings_unittests',
             '../mojo/mojo_edk_tests.gyp:mojo_public_system_perftests',
             '../mojo/mojo_edk_tests.gyp:mojo_public_system_unittests',
-            '../mojo/mojo_edk_tests.gyp:mojo_public_utility_unittests',
             '../net/net.gyp:crash_cache',
             '../net/net.gyp:crl_set_dump',
             '../net/net.gyp:dns_fuzz_stub',
@@ -567,7 +566,6 @@
             '../media/midi/midi.gyp:midi_unittests_run',
             '../mojo/mojo_edk_tests.gyp:mojo_public_bindings_unittests_run',
             '../mojo/mojo_edk_tests.gyp:mojo_public_system_unittests_run',
-            '../mojo/mojo_edk_tests.gyp:mojo_public_utility_unittests_run',
             '../net/net.gyp:net_unittests_run',
             '../ppapi/ppapi_internal.gyp:ppapi_unittests_run',
             '../printing/printing.gyp:printing_unittests_run',