Remove mojo/apps/js, it is unused

mojo/apps/js/bindings/monotonic_clock.cc

-// 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.
-
-#include "mojo/apps/js/bindings/monotonic_clock.h"
-
-#include "base/time/time.h"
-#include "gin/object_template_builder.h"
-#include "gin/per_isolate_data.h"
-#include "gin/public/wrapper_info.h"
-#include "mojo/public/cpp/system/core.h"
-
-namespace mojo {
-namespace apps {
-
-namespace {
-
-gin::WrapperInfo g_wrapper_info = { gin::kEmbedderNativeGin };
-
-double GetMonotonicSeconds() {
-  return static_cast<double>(mojo::GetTimeTicksNow()) /
-      base::Time::kMicrosecondsPerSecond;
-}
-
-}  // namespace
-
-const char MonotonicClock::kModuleName[] = "monotonic_clock";
-
-v8::Local<v8::Value> MonotonicClock::GetModule(v8::Isolate* isolate) {
-  gin::PerIsolateData* data = gin::PerIsolateData::From(isolate);
-  v8::Local<v8::ObjectTemplate> templ =
-      data->GetObjectTemplate(&g_wrapper_info);
-  if (templ.IsEmpty()) {
-    templ = gin::ObjectTemplateBuilder(isolate)
-        .SetMethod("seconds", GetMonotonicSeconds)
-        .Build();
-    data->SetObjectTemplate(&g_wrapper_info, templ);
-  }
-  return templ->NewInstance();
-}
-
-}  // namespace apps
-}  // namespace mojo