Bug 117601 [Undo] - update org.eclipse.core.commands.operations to use new equinox common utils
org.eclipse.core.commands.operations.DefaultOperationHistory - synchronizes its own listener list org.eclipse.core.commands.internal.util. - implements its own Assert. These should be updated to use the new support in org.eclipse.equinox.common
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/operations/DefaultOperationHistory.java
status = IOperationHistory.OPERATION_INVALID_STATUS;
		}
		return status;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.commands.operations.IOperationHistory#removeOperationApprover(org.eclipse.core.commands.operations.IOperationApprover)
	 */
	public void removeOperationApprover(IOperationApprover approver) {
		approvers.remove(approver);
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.commands.operations.IOperationHistory#removeOperationHistoryListener(org.eclipse.core.commands.operations.IOperationHistoryListener)
	 */
	public void removeOperationHistoryListener(
			IOperationHistoryListener listener) {
		listeners.remove(listener);
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.commands.operations.IOperationHistory#replaceOperation(org.eclipse.core.commands.operations.IUndoableOperation,
	 *      org.eclipse.core.commands.operations.IUndoableOperation [])
	 */
	public void replaceOperation(IUndoableOperation operation,
			IUndoableOperation[] replacements) {