Remove unused properties and variables

The code that used these were removed in the following commits:

* 9ff86fb718 (RFB._mouse_arr)
* bb6965f2e6 (old_requestAnimationFrame)
* 490d471c53 (Display._c_forceCanvas)

core/display.js

@@ -13,7 +13,6 @@ import { supportsImageMetadata } from './util/browser.js';
 export default class Display {
     constructor(target) {
         this._drawCtx = null;
-        this._c_forceCanvas = false;
 
         this._renderQ = [];  // queue drawing actions for in-oder rendering
         this._flushing = false;

core/rfb.js

@@ -134,7 +134,6 @@ export default class RFB extends EventTargetMixin {
 
         // Mouse state
         this._mouse_buttonMask = 0;
-        this._mouse_arr = [];
         this._viewportDragging = false;
         this._viewportDragPos = {};
         this._viewportHasMoved = false;

tests/test.display.js

@@ -385,10 +385,6 @@ describe('Display/Canvas Helper', function () {
             sinon.spy(display, '_scan_renderQ');
         });
 
-        afterEach(function () {
-            window.requestAnimationFrame = this.old_requestAnimationFrame;
-        });
-
         it('should try to process an item when it is pushed on, if nothing else is on the queue', function () {
             display._renderQ_push({ type: 'noop' });  // does nothing
             expect(display._scan_renderQ).to.have.been.calledOnce;