IDL: Remove duplicated typedefs

Typedefs have per-component visibility so we don't need to have
duplicated definitions.

BUG=627286

CQ_INCLUDE_TRYBOTS=tryserver.chromium.win:win_optional_gpu_tests_rel;tryserver.chromium.mac:mac_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2138673002
Cr-Commit-Position: refs/heads/master@{#405429}
7 files changed