[Code cleanup]Remove webui virtual keyboard code

ui/keyboard/resources/webui/main.css

-/*
- Copyright (c) 2013 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.
-*/
-
-body {
-  -webkit-box-pack: center;
-  -webkit-user-select: none;
-  background-color: #0b0b0b;
-  display: -webkit-box;
-  margin: 0;
-  overflow: hidden;
-  padding: 0;
-}
-
-kb-keyboard {
-  -webkit-box-orient: vertical;
-  display: -webkit-box;
-}
-
-kb-abc-key,
-kb-shift-key,
-kb-key {
-  background-color: #3b3b3e;
-  background-position: center center;
-  background-repeat: no-repeat;
-  background-size: contain;
-  border-top: 2px solid #4b4b4e;
-  border-radius: 1px;
-  color: #ffffff;
-  display: -webkit-box;
-  font-family: 'Open Sans', sans-serif;
-  font-weight: 600;
-  margin-left: 0.2em;
-  position: relative;
-}
-
-kb-abc-key::x-key,
-kb-shift-key::x-key,
-kb-key::x-key {
-  bottom: 0;
-  height: 1.2em;
-  left: 0;
-  margin: auto;
-  padding-left: 0.5em;
-  padding-right: 0.5em;
-  position: absolute;
-  right: 0;
-  top: 0;
-}
-
-kb-key::x-hinttext {
-  color: #7c7c7c;
-  font-size: 70%;
-  position: absolute;
-  right: 7%;
-  top: 5%;
-}
-
-kb-key::x-key[inverted] {
-  color: #7c7c7c;
-}
-
-kb-key::x-hinttext[inverted] {
-  color: #ffffff;
-}
-
-kb-abc-key.dark,
-kb-shift-key.dark,
-kb-key.dark {
-  background-color: #2a2a2c;
-  border-top: 2px solid #3a3a3c;
-}
-
-kb-altkey::x-key {
-  bottom: 0;
-  height: 1.2em;
-  left: 0;
-  margin: auto;
-  position: absolute;
-  right: 0;
-  top: 0;
-  text-align: center;
-}
-
-/* Left and right-side special keys with a character letter next to them need
- * additional padding.
- * */
-kb-abc-key.padded-left-special,
-kb-shift-key.padded-left-special,
-kb-key.padded-left-special {
-  margin-right: 2px;
-}
-
-kb-abc-key.padded-right-special,
-kb-shift-key.padded-right-special,
-kb-key.padded-right-special {
-  margin-left: 5px;
-}
-
-kb-row.top {
-  margin-top: 5px !important;
-}
-
-.active {
-  background-color: #848490 !important;
-  border-top: 2px solid #A9A9AF !important;
-  /* Do not use box shadow until performance improves
-   * http://code.google.com/p/chromium/issues/detail?id=99045
-   * box-shadow: 0px 0px 15px #fff;
-   * */
-}
-
-.at,
-.com,
-.comma,
-.hide,
-.microphone,
-.period,
-.tab {
-  -webkit-box-flex: 1.3 !important;
-}
-
-.symbol,
-.return {
-  -webkit-box-flex: 1.5 !important;
-}
-
-.backspace {
-  -webkit-box-flex: 1.7 !important;
-}
-
-.left-more {
-  -webkit-box-flex: 1.4 !important;
-}
-
-.right-more {
-  -webkit-box-flex: 1.6 !important;
-}
-
-.space {
-  -webkit-box-flex: 4.8 !important;
-}
-
-.bar {
-  -webkit-box-flex: 0.6 !important;
-}
-
-.backspace,
-.tab,
-.return,
-.shift,
-.left-more,
-.right-more,
-.symbol {
-  font-size: 55%;
-  font-weight: 200;
-}
-
-.microphone {
-  background-image: url('images/microphone.svg');
-}
-
-.audio .microphone {
-  background-image: url('images/microphone-green.svg');
-}
-
-.half-key-spacer {
-  -webkit-box-flex: 0.5;
-  margin-left: 4px;
-}