remove electron specific tests

src/vs/platform/clipboard/test/electron-browser/clipboardService.test.ts

-/*---------------------------------------------------------------------------------------------
- *  Copyright (c) Microsoft Corporation. All rights reserved.
- *  Licensed under the MIT License. See License.txt in the project root for license information.
- *--------------------------------------------------------------------------------------------*/
-'use strict';
-
-import * as assert from 'assert';
-import { ClipboardService } from 'vs/platform/clipboard/electron-browser/clipboardService';
-import URI from 'vs/base/common/uri';
-
-suite('ClipboardService', () => {
-	test('writeFiles, hasFiles, readFiles', function () {
-		const clipboardService = new ClipboardService();
-
-		clipboardService.writeText('test');
-		assert.ok(!clipboardService.hasFiles());
-
-		const files: URI[] = [];
-		files.push(URI.file('/test/file.txt'));
-		files.push(URI.file('/test/otherfile.txt'));
-
-		clipboardService.writeFiles(files);
-
-		assert.ok(clipboardService.hasFiles());
-
-		const clipboardFiles = clipboardService.readFiles();
-		assert.equal(clipboardFiles.length, 2);
-		assert.equal(clipboardFiles[0].fsPath, files[0].fsPath);
-		assert.equal(clipboardFiles[1].fsPath, files[1].fsPath);
-
-		clipboardService.writeText('test');
-		assert.ok(!clipboardService.hasFiles());
-	});
-});
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