Disable D3D11 on systems with AMD switchable graphics.
Disable D3D11 on systems with AMD switchable graphics.

They may have problems when using hardware video decoding and D3D11 on the discrete gpu.

BUG=451420
TBR=zmo@chromium.org

Review URL: https://codereview.chromium.org/875403009

Cr-Commit-Position: refs/heads/master@{#315165}
(cherry picked from commit ae441cb44c78cc91ba0169e6b1fa30ebaf968c1f)

Review URL: https://codereview.chromium.org/871013011

Cr-Commit-Position: 665a5787e4610f1ec55d3a4e2f02ab0724e38987@{#245}
Cr-Branched-From: 4cd5f18d847990599feba509541d8a7b9a16883a@{#310958}

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