Revert of Move LatencyInfo to ui/latency_info

ui/latency_info/BUILD.gn

-# Copyright 2016 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")
-
-component("latency_info") {
-  sources = [
-    "latency_info.cc",
-    "latency_info.h",
-    "latency_info_export.h",
-  ]
-
-  defines = [ "LATENCY_INFO_IMPLEMENTATION" ]
-
-  deps = [
-    "//base",
-  ]
-}
-
-test("latency_info_unittests") {
-  sources = [
-    "latency_info_unittest.cc",
-  ]
-
-  deps = [
-    ":latency_info",
-    "//base",
-    "//base/test:run_all_unittests",
-    "//base/test:test_support",
-    "//testing/gmock",
-    "//testing/gtest",
-  ]
-
-  if (!is_ios) {
-    sources += [ "ipc/latency_info_param_traits_unittest.cc" ]
-    deps += [
-      "//ipc:test_support",
-      "//ui/latency_info/ipc",
-    ]
-  }
-}