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
return filter(undoList, context);
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.commands.operations.IOperationHistory#getUndoOperation(org.eclipse.core.commands.operations.IUndoContext)
	 */
	public IUndoableOperation getUndoOperation(IUndoContext context) {
		Assert.isNotNull(context);
		synchronized (undoRedoHistoryLock) {
			for (int i = undoList.size() - 1; i >= 0; i--) {
				IUndoableOperation operation = (IUndoableOperation) undoList
						.get(i);
				if (operation.hasContext(context)) {
					return operation;
				}
			}
		}
		return null;
	}
	/*
	 * Remove the operation by disposing it and notifying listeners.
	 */
	private void internalRemove(IUndoableOperation operation) {
		operation.dispose();
		notifyRemoved(operation);
	}
	/*
	 * Notify listeners of an operation event.
	 */