Bug 88838 [Undo] - API cleanup - remove IContextConsultingOperationApprover
Early on this was involved in scenarios where editors examined other operations. This is no longer used. Operation approvers generally apply to all contexts and are installed at the OperationHistory level. Until there is a concrete need for this API it should be removed. It is gratuitous at this point.
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/operations/DefaultOperationHistory.java
remove(operation);
			}
		}
		return status;
	}
	/**
	 * Perform the undo. All validity checks have already occurred.
	 * 
	 * @param monitor
	 * @param operation
	 */
	protected IStatus doUndo(IProgressMonitor monitor, IAdaptable info, IUndoableOperation operation,
			boolean flushOnError) throws ExecutionException {
		IStatus status = getUndoApproval(operation, info);
		if (status.isOK()) {
			notifyAboutToUndo(operation);
			try {
				status = operation.undo(monitor, info);
			} catch (OperationCanceledException e) {
				status = Status.CANCEL_STATUS;
			} catch (ExecutionException e) {
				notifyNotOK(operation);
				if (DEBUG_OPERATION_HISTORY_UNEXPECTED) {
					System.out.print("OPERATIONHISTORY >>> ExecutionException while undoing ");  
					System.out.print(operation);
					System.out.println();
				}
				throw e;
			} catch (Exception e) {
				notifyNotOK(operation);