[fuchsia] Remove v8.cmx, as it is no longer used

Bug: v8:12589
Change-Id: Idf341625f8fadf4a0145887c0ec6642b5e6bfd88
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3885882Reviewed-by: Alexander Schulze <alexschulze@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83145}

gni/OWNERS

 file:../INFRA_OWNERS
 
 per-file v8.cml=victorgomes@chromium.org
-per-file v8.cmx=victorgomes@chromium.org
 per-file release_branch_toggle.gni=v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com
 per-file release_branch_toggle.gni=vahl@chromium.org

gni/v8.cmx

-{
-  "facets": {
-    "fuchsia.test": {
-      "system-services": [
-        "fuchsia.kernel.VmexResource"
-      ]
-    }
-  },
-  "sandbox": {
-    "dev": [
-      "null",
-      "zero"
-    ],
-    "features": [
-      "deprecated-ambient-replace-as-executable",
-      "isolated-cache-storage",
-      "isolated-persistent-storage",
-      "isolated-temp",
-      "root-ssl-certificates",
-      "vulkan"
-    ],
-    "services": [
-      "fuchsia.accessibility.semantics.SemanticsManager",
-      "fuchsia.camera3.DeviceWatcher",
-      "fuchsia.device.NameProvider",
-      "fuchsia.fonts.Provider",
-      "fuchsia.intl.PropertyProvider",
-      "fuchsia.kernel.VmexResource",
-      "fuchsia.logger.Log",
-      "fuchsia.logger.LogSink",
-      "fuchsia.media.Audio",
-      "fuchsia.media.SessionAudioConsumerFactory",
-      "fuchsia.media.drm.Widevine",
-      "fuchsia.mediacodec.CodecFactory",
-      "fuchsia.memorypressure.Provider",
-      "fuchsia.net.NameLookup",
-      "fuchsia.net.interfaces.State",
-      "fuchsia.posix.socket.Provider",
-      "fuchsia.process.Launcher",
-      "fuchsia.sys.Environment",
-      "fuchsia.sys.Launcher",
-      "fuchsia.sys.Loader",
-      "fuchsia.sysmem.Allocator",
-      "fuchsia.ui.input.ImeService",
-      "fuchsia.ui.input.ImeVisibilityService",
-      "fuchsia.ui.scenic.Scenic",
-      "fuchsia.ui.policy.Presenter",
-      "fuchsia.vulkan.loader.Loader",
-      "fuchsia.web.ContextProvider"
-    ]
-  }
-}