To to remove goto Help -> About Eclispe SDK -> Installation Details and select the feature you want to remove.
More info: You should not remove plug-ins from Eclipse. Plug-ins should be installed as features using the Update Manager. The same Update Manager can be used to disable plug-ins by disabling the feature they belong to. Run Help > Software Updates > Manage Configuration…, select the feature of interest, and disable it with the task shown in the right window. In newer versions, you might need to Run Help > About Eclipse SDK > Installation Details, and then select the software you no longer want and click Uninstall. (On Macintosh it isEclipse > About Eclipse > Installation Details.)
Further look here