Bug 139986 [CommonNavigator] Convert catch(Error/Throwable) to SafeRunner
In several places the CN framework uses catch(Error/Throwable) to ensure that code does not bring the framework down. Change these to use SafeRunner.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/extensions/NavigatorContentExtension.java
return descriptor.getId();
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.ui.internal.navigator.extensions.INavigatorContentExtension
	 * #getDescriptor()
	 */
	public INavigatorContentDescriptor getDescriptor() {
		return descriptor;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.ui.navigator.INavigatorContentExtension#getContentProvider()
	 */
	public ITreeContentProvider getContentProvider() {
		return internalGetContentProvider().getDelegateContentProvider();
	}
	/**
	 * 
	 * @return The internal content provider that is wrapped by this extension.
	 */
	public SafeDelegateTreeContentProvider internalGetContentProvider() {
		if (contentProvider != null || contentProviderInitializationFailed) {
			return contentProvider;
		}
		synchronized (this) {