Mojo C++ bindings: fix the for_blink_tests target.

mojo/public/cpp/bindings/tests/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("../../../mojo_application.gni")
 
 source_set("tests") {
   testonly = true
 
   sources = [
@@ skipping 61 matching lines @@
   testonly = true
 
   sources = [
     "wtf_types_unittest.cc",
   ]
 
   deps = [
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/bindings:callback",
     "//mojo/public/cpp/system",
-    "//mojo/public/cpp/test_support:test_utils",
     "//mojo/public/interfaces/bindings/tests:test_wtf_types",
     "//mojo/public/interfaces/bindings/tests:test_wtf_types_blink",
     "//testing/gtest",
   ]
 }
 
 source_set("perftests") {
   testonly = true
 
   sources = [
@@ skipping 17 matching lines @@
 source_set("mojo_public_bindings_test_utils") {
   sources = [
     "validation_test_input_parser.cc",
     "validation_test_input_parser.h",
   ]
 
   deps = [
     "//mojo/public/c/system",
   ]
 }