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This reverts commit 6536130a.

Reason for revert: crbug.com/1098633

Original change's description:
> [PTZ] Add mocking points to VideoCaptureDeviceFactoryWin
> 
> This CL refactors video capture device creation on Windows, removes some
> code duplications related to DirectShow device enumeration and adds
> mocking points for unit testing. This CL has no functional changes.
> 
> Bug: 934063
> Change-Id: I2df08b3a361ffd702761bd9d6b400f4418390c99
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2247797
> Commit-Queue: Eero Häkkinen <eero.hakkinen@intel.com>
> Auto-Submit: Eero Häkkinen <eero.hakkinen@intel.com>
> Reviewed-by: Guido Urdaneta <guidou@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#781357}

TBR=eero.hakkinen@intel.com,guidou@chromium.org

Change-Id: I967f2eccd57c9847d85201ad57d28ad804691fff
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 934063
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2263193Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781804}