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ENABLED_SCREEN_CAPTURE is not flag to enable DesktopCaptureDevice.
It enables DesktopCaptureDeviceAura (if use_aura=1).

Use BUILDFLAG(ENABLE_WEBRTC) instead of ENABLED_SCREEN_CAPTURE to
use DesktopCaptureDevice in VidepCaptureManager.

BUG=internal b/34176576

Review-Url: https://codereview.chromium.org/2625553003
Cr-Commit-Position: refs/heads/master@{#442957}