/usr/share/eclipse/dropins/subclipse-mylyn/ is in eclipse-subclipse-mylyn 1.8.16-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/eclipse/dropins/subclipse-mylyn/eclipse/
/usr/share/eclipse/dropins/subclipse-mylyn/eclipse/features/
/usr/share/eclipse/dropins/subclipse-mylyn/eclipse/features/org.tigris.subversion.subclipse.mylyn_3.0.0//
/usr/share/eclipse/dropins/subclipse-mylyn/eclipse/features/org.tigris.subversion.subclipse.mylyn_3.0.0/changes.html
/usr/share/eclipse/dropins/subclipse-mylyn/eclipse/features/org.tigris.subversion.subclipse.mylyn_3.0.0/feature.properties
/usr/share/eclipse/dropins/subclipse-mylyn/eclipse/features/org.tigris.subversion.subclipse.mylyn_3.0.0/feature.xml
/usr/share/eclipse/dropins/subclipse-mylyn/eclipse/features/org.tigris.subversion.subclipse.mylyn_3.0.0/license.html
/usr/share/eclipse/dropins/subclipse-mylyn/eclipse/plugins/
/usr/share/eclipse/dropins/subclipse-mylyn/eclipse/plugins/org.tigris.subversion.subclipse.mylyn_3.0.0.jar