Conditionally disable bthledef.h workaround
Conditionally disable bthledef.h workaround

The bthledef.h header file is fixed in the Windows 10 SDK. This change
detects when that SDK is being used and conditionally applies a fix. The
conditional fix can be removed once we fully move to the Windows 10 SDK.

The original workaround was checked in by cl
https://codereview.chromium.org/720033003

R=rpaquay@chromium.org
BUG=491424

Review URL: https://codereview.chromium.org/1233393002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#339160}

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