Bug 299340 [CommonNavigator] Enable new CNF tests
Enable the contributed CNF tests, make minor test improvements.
tests/org.eclipse.ui.tests.navigator/src/org/eclipse/ui/tests/navigator/PipelineTest.java
public PipelineTest() {
		_navigatorInstanceId = TEST_VIEWER_PIPELINE;
	}
	public void testNavigatorResourceJava() throws Exception {
		assertEquals(
				"There should be no visible extensions for the pipeline viewer.",
				0, _contentService.getVisibleExtensionIds().length);
		_contentService.bindExtensions(new String[] {
				COMMON_NAVIGATOR_RESOURCE_EXT, COMMON_NAVIGATOR_JAVA_EXT },
				false);
		
		
		assertEquals(
				"There should be two visible extensions for the pipeline viewer.",
				2, _contentService.getVisibleExtensionIds().length);