BUILD: Remove temporary fuzzer alias

This was used to allow Dawn to roll into Chromium.

The usage of this build rule has been removed:
https://chromium-review.googlesource.com/c/chromium/src/+/3427755

So this can now be deleted.

Bug: dawn:1275
Change-Id: If080cf3b576b51b2522699ae2063419bcaeba7c5
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/78804
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Ben Clayton <bclayton@google.com>

src/fuzzers/BUILD.gn

@@ -1,22 +0,0 @@
-# Copyright 2022 The Dawn Authors
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# TODO(crbug.com/dawn/1275) - Remove this file once all external references to
-# this build file have been fixed up to use src/fuzzers/dawn instead.
-
-# TODO(crbug.com/dawn/1275) - Alias to "src/fuzzers/dawn:dawn_fuzzers"
-group("dawn_fuzzers") {
-  testonly = true
-  public_deps = [ "dawn:dawn_fuzzers" ]
-}