Replace checkbox icon with icon font

src/vs/base/browser/ui/checkbox/check-dark.svg

-<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
-<path fill-rule="evenodd" clip-rule="evenodd" d="M15 3.76345L5.80687 11.9351L5.08584 11.8927L1 7.29614L1.76345 6.61752L5.50997 10.8324L14.3214 3L15 3.76345Z" fill="#C5C5C5"/>
-</svg>

src/vs/base/browser/ui/checkbox/check-light.svg

-<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
-<path fill-rule="evenodd" clip-rule="evenodd" d="M15 3.76345L5.80687 11.9351L5.08584 11.8927L1 7.29614L1.76345 6.61752L5.50997 10.8324L14.3214 3L15 3.76345Z" fill="#424242"/>
-</svg>

src/vs/base/browser/ui/checkbox/checkbox.css

@@ -43,11 +43,3 @@
 	opacity: 1;
 	background-size: 16px !important;
 }
-
-.monaco-custom-checkbox.monaco-simple-checkbox.checked {
-	background: url('check-light.svg') center center no-repeat;
-}
-
-.monaco-custom-checkbox.monaco-simple-checkbox.checked {
-	background: url('check-dark.svg') center center no-repeat;
-}

src/vs/base/browser/ui/checkbox/checkbox.ts

@@ -99,7 +99,7 @@ export class Checkbox extends Widget {
 
 		this.domNode = document.createElement('div');
 		this.domNode.title = this._opts.title;
-		this.domNode.className = 'monaco-custom-checkbox codicon ' + (this._opts.actionClassName || '') + ' ' + (this._checked ? 'checked' : 'unchecked');
+		this.domNode.className = 'monaco-custom-checkbox codicon ' + (this._opts.actionClassName || '') + ' ' + (this._checked ? 'codicon-check' : 'unchecked');
 		this.domNode.tabIndex = 0;
 		this.domNode.setAttribute('role', 'checkbox');
 		this.domNode.setAttribute('aria-checked', String(this._checked));
@@ -143,9 +143,9 @@ export class Checkbox extends Widget {
 		this._checked = newIsChecked;
 		this.domNode.setAttribute('aria-checked', String(this._checked));
 		if (this._checked) {
-			this.domNode.classList.add('checked');
+			this.domNode.classList.add('codicon-check');
 		} else {
-			this.domNode.classList.remove('checked');
+			this.domNode.classList.remove('codicon-check');
 		}
 
 		this.applyStyles();