Remove the blue tool-bar for apps v2.

remoting/webapp/window_frame.css

 /* 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.
  */
 
 html.apps-v2,
 html.apps-v2 body {
   height: 100%;
   width: 100%;
 }
 
 html.apps-v2 body:not(.fullscreen) {
   border: 1px solid gray;  /* This is the window border. */
 }
 
 html.apps-v2 .title-bar {
   border-bottom: 1px solid gray;
   z-index: 100;
 }
 
 .window-title,
 .window-controls-hover-target {
   height: 32px;
   line-height: 32px;
-  font-size: 16px;
+  font-size: 14px;
   background-color: #c4c4c4;
 }
 
 .title-bar .window-title {
   padding-__MSG_@@bidi_start_edge__: 12px;
   width: 100%;
   display: inline-block;
   -webkit-app-region: drag;
 }
 
@@ skipping 13 matching lines @@
 }
 
 .window-control {
   height: 32px;
   width: 32px;
   text-align: center;
   display: inline-block;
   border-__MSG_@@bidi_start_edge__: 1px solid rgba(0, 0, 0, 0.2);
 }
 
+.window-control > span.menu-button-activator {
+  display: inline-block;
+  width: 100%;
+  height: 100%;
+}
+
 .window-control:hover {
   background-color: #d5d5d5;
 }
 
 .window-control:active {
   background-color: #a6a6a6;
 }
 
-.window-control > img {
+.window-control img {
   margin-bottom: -2px;
 }
 
 .window-controls-stub {
   display: none;
   -webkit-column-span: all;
   line-height: 3px;
   background: url("drag.webp");
   border-top: 1px solid rgba(0, 0, 0, 0.2);
 }
@@ skipping 24 matching lines @@
   height: 100%;
   position: absolute;
   top: 0;
   left: 0;
   border-left: 1px solid rgba(255, 255, 255, 0.2);
   border-top: 1px solid rgba(255, 255, 255, 0.2);
   pointer-events: none;
 }
 
 
-/* When connected to a host, the Disconnect button is displayed. */
-body:not(.connected) .window-disconnect {
+/* The Disconnect and Options buttons are only displayed when connected. */
+body:not(.connected) .window-disconnect,
+body:not(.connected) .window-options {
   display: none;
 }
 
 
 /*
  * When in full-screen mode, significant changes are made:
  * - The scroll-bars are removed.
  * - The window controls have a border (so the left-border of the first button
  *   is not needed).
  * - The title-bar (and its bottom border) are not displayed.
@@ skipping 32 matching lines @@
 
 body.fullscreen .window-controls-hover-target {
   transition-property: opacity, box-shadow, top;
   transition-duration: 0.3s;
   opacity: 0.7;
   top: -33px;
   __MSG_@@bidi_end_edge__: 8px;
 }
 
 body.fullscreen .window-controls-hover-target:hover,
-body.fullscreen .window-controls-hover-target.opened {
+body.fullscreen .window-controls-hover-target.opened,
+body.fullscreen .window-controls-hover-target.menu-opened {
   top: -4px;
   opacity: 1.0;
   box-shadow: 1px 1px 10px rgba(0, 0, 0, 0.5);
 }
 
 .fullscreen .window-controls-hover-target.opened .window-controls-stub {
-    background-color: #a6a6a6;
+  background-color: #a6a6a6;
 }