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
* (non-Javadoc)
	 * 
	 * @see org.eclipse.core.commands.operations.IOperationHistory#redoOperation(org.eclipse.core.commands.operations.IUndoableOperation, org.eclipse.core.runtime.IProgressMonitor, org.eclipse.core.runtime.IAdaptable)
	 */
	public IStatus redoOperation(IUndoableOperation operation, IProgressMonitor monitor, IAdaptable info) throws ExecutionException {
		Assert.isNotNull(operation);
		IStatus status;
		if (operation.canRedo()) {
			status = getRedoApproval(operation, info);
			if (status.isOK()) {
				status = doRedo(monitor, info, operation, false);
			}
		} else {
			if (DEBUG_OPERATION_HISTORY_UNEXPECTED) {
				System.out.print("OPERATIONHISTORY >>> Redo operation not valid - ");  
				System.out.print(operation);
				System.out.println();
			}
			status = OPERATION_INVALID_STATUS;
		}
		return status;
	}
	/**
	 * Remove the specified operation from the undo and redo history
	 */
	private void remove(IUndoableOperation operation) {
		if (undoList.contains(operation)) {
			undoList.remove(operation);
			internalRemove(operation);
		} else if (redoList.contains(operation)) {