chrome: Remove perf_tests target.

chrome/test/perf/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("//testing/test.gni")
-
-if (!is_win || link_chrome_on_windows) {
-  # This test appears to be a legacy target consisting of files not yet moved
-  # elsewhere.
-  test("perf") {
-    output_name = "perf_tests"
-
-    sources = [
-      "perftests.cc",
-      "url_parse_perftest.cc",
-    ]
-
-    deps = [
-      "//base",
-      "//base/allocator",
-      "//base/test:test_support",
-      "//testing/gtest",
-      "//url",
-    ]
-  }
-} else {
-  group("perf") {
-  }
-}