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
boolean found = false;
		for (int i = 0; i < rootItems.length && !found; i++) {
			if (rootItems[i].getData() instanceof IProject) {
				IProject newProjectFromTree = (IProject) rootItems[i].getData();
				if (newProject.equals(newProjectFromTree))
					found = true;
			}
		}
		assertTrue(found);
	}
	
	public void testInterceptAddThrow() throws Exception {
		_contentService.bindExtensions(new String[] {
				COMMON_NAVIGATOR_RESOURCE_EXT, TEST_CONTENT_PIPELINED},
				false);
		_contentService.getActivationService().activateExtensions(
				new String[] { COMMON_NAVIGATOR_RESOURCE_EXT,
						TEST_CONTENT_PIPELINED }, true);
		refreshViewer();
		
		_viewer.setSelection(new StructuredSelection(_project
				.getFile(".project")), true); 
		IFile f = _project.getFile("newfile");
		TestContentProviderPipelined._throw = true;
		
		_viewer.add(_project, new Object[] { f });
	}	
	
}