[fuchsia] Update input services in web_instance.cmx sandbox config.

Adds the recently supported input3 and new virtual keyboard APIs
to `web_instance.cmx`.

Removes unused/obsolete IME services from the cmx.

Bug: fuchsia:73273
Bug: 1010222
Change-Id: I705fa25cecd214278a56280c7237a98e7a26e414
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2872965
Auto-Submit: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#879113}

fuchsia/engine/web_instance.cmx

@@ -13,6 +13,7 @@
       "fuchsia.camera3.DeviceWatcher",
       "fuchsia.device.NameProvider",
       "fuchsia.fonts.Provider",
+      "fuchsia.input.virtualkeyboard.ControllerCreator",
       "fuchsia.intl.PropertyProvider",
       "fuchsia.legacymetrics.MetricsRecorder",
       "fuchsia.logger.LogSink",
@@ -28,8 +29,7 @@
       "fuchsia.process.Launcher",
       "fuchsia.settings.Display",
       "fuchsia.sysmem.Allocator",
-      "fuchsia.ui.input.ImeService",
-      "fuchsia.ui.input.ImeVisibilityService",
+      "fuchsia.ui.input3.Keyboard",
       "fuchsia.ui.scenic.Scenic",
       "fuchsia.vulkan.loader.Loader"
     ]