Revert "WebNN: Handle device-removal error on DirectML"

This reverts commit 3a4889b10ae431826f47b005e0d36c13aab95a2d.

Reason for revert: suspected cause of issue 366573639

Original change's description:
> WebNN: Handle device-removal error on DirectML
>
> This CL kills the GPU process to destroy all contexts if
> device-removal[1] error happens on DirectML on services side.
>
> GPU/NPU contexts on DirectML rely on the same device[2]. If the
> device enters a "device-removed" state, all affected contexts become
> unavailable and should be destroyed immediately.
>
> Additionally, since other components besides WebNN may reference the
> device, so we have to terminate the GPU process to allow for the
> re-creation of the device and recovery from device removal.
>
> [1] https://learn.microsoft.com/en-us/windows/ai/directml/dml-errors
> [2] https://learn.microsoft.com/en-us/windows/win32/api/d3d12/nn-d3d12-id3d12device
>
> Bug: 349640008
> Change-Id: I89b3bfefadfe4f5c92e0c5c0fd5104080822e6a2
> Cq-Include-Trybots: luci.chromium.try:win11-blink-rel, mac14.arm64-blink-rel, mac14-blink-rel, mac15.arm64-blink-rel, mac15-blink-rel, linux-blink-rel
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5833441
> Reviewed-by: ningxin hu <ningxin.hu@intel.com>
> Reviewed-by: Rafael Cintron <rafael.cintron@microsoft.com>
> Commit-Queue: Mingming1 Xu <mingming1.xu@intel.com>
> Reviewed-by: Reilly Grant <reillyg@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1355090}

Bug: 349640008,366573639
Change-Id: I49f2d0f7e8d23fcfed54a0574b765f0c500addd5
Cq-Include-Trybots: luci.chromium.try:win11-blink-rel, mac14.arm64-blink-rel, mac14-blink-rel, mac15.arm64-blink-rel, mac15-blink-rel, linux-blink-rel
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5863325
Owners-Override: Daniel Yip <danielyip@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Daniel Yip <danielyip@google.com>
Cr-Commit-Position: refs/heads/main@{#1355873}