Remove unnecessary ExceptionCode.h inclusion
Though ExceptionCode.h is included, it's not used in some of the places
CQ_INCLUDE_TRYBOTS=tryserver.chromium.win:win_optional_gpu_tests_rel;tryserver.chromium.mac:mac_optional_gpu_tests_rel
Committed:
https://crrev.com/d48ae33df6ad22f1576681d2e4a1df774f8023c9
Cr-Commit-Position: refs/heads/master@{#389472}