Remove starboard:gn_all dep on crashpad/handler (#1125)

After Cobalt 23 we want the crashpad_handler binary to always be built
with the native target toolchain, and never with Starboard. With this
PR, the ninja files for the Starboard-based target will no longer be
generated.

b/270858365

Change-Id: I3d206468bbf2385a79506c164b68b6ee98d97982

starboard/BUILD.gn

@@ -66,15 +66,7 @@ group("gn_all") {
     deps += [ "//third_party/lz4_lib:lz4" ]
 
     if (sb_is_evergreen_compatible) {
-      deps += [
-        "//third_party/crashpad/client",
-
-        # TODO(b/270858365): remove this dependency on the Starboard-based
-        # target (from the target toolchain) once Buildbot is using the native
-        # target (from native_target toolchain) and no longer declares the
-        # Starboard-based one as a build target.
-        "//third_party/crashpad/handler",
-      ]
+      deps += [ "//third_party/crashpad/client" ]
       data_deps = [
         "//starboard/loader_app",
         "//third_party/crashpad/handler:crashpad_handler(//$starboard_path/toolchain:native_target)",