Remove GardeningServer.

Tools/GardeningServer/base/ct-canvas-2d-context-mock.html

-<!--
-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.
--->
-
-<script>
-function CTCanvas2dContextMock() {
-  this.imageSmoothingEnabled = true;
-  this._translate = {x: 0, y: 0};
-  this._strokeRect = {x: 0, y: 0, width: 0, height: 0};
-  this._scale = {x: 1, y: 1};
-  this._drawImagePosition = {x: 0, y: 0};
-}
-
-CTCanvas2dContextMock.prototype.translate = function(x, y) {
-  this._translate = {
-    x: this._translate.x + x,
-    y: this._translate.y + y,
-  };
-}
-
-CTCanvas2dContextMock.prototype.strokeRect = function(x, y, width, height) {
-  this._strokeRect = {x: x, y: y, width: width, height: height};
-}
-
-CTCanvas2dContextMock.prototype.scale = function(x, y) {
-  this._scale = {
-    x: this._scale.x * x,
-    y: this._scale.y * y,
-  };
-}
-
-CTCanvas2dContextMock.prototype.drawImage = function(image, x, y) {
-  this._drawImagePosition = {x: x, y: y};
-}
-</script>