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fix: preload SwiftShader before the GPU sandbox locks down again - #53197
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Reverts the gpu_init.cc change from https://crrev.com/c/7636200 (Chromium 148). Since then the GPU process only preloads vk_swiftshader.dll when SwiftShader is requested on the command line, but WebGPU still falls back to it when no D3D12 adapter is usable. That load now happens after MITIGATION_FORCE_MS_SIGNED_BINS is in force and is rejected by Code Integrity; in AppX/MSIX packages the rejection terminates the GPU process and flags the package for repair. Fixes #52700 No-Verification-Needed: Windows-only Chromium patch; no runtime surface on Linux. Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>
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Backport of #53174
See that PR for details.
Notes: Fixed the GPU process being terminated in AppX/MSIX packaged apps on Windows when WebGPU fell back to SwiftShader.