FTBFS: The import org.eclipse.egit.ui.internal.FilteredCheckboxTree cannot be resolved

Imported from Debian bug http://bugs.debian.org/789988:

Package: eclipse-mylyn-tasks-github
Version: 3.3.0-1
Severity: serious
Justification: fails to build from source (but built successfully in the past)

Dear Maintainer,

The package fails to build, probably because egit has changed:

@dot:
    [mkdir] Created dir: /tmp/buildd/eclipse-mylyn-tasks-github-3.3.0/debian/.eclipse-build/org.eclipse.mylyn.github.ui/@dot
    [javac] Compiling 50 source files to /tmp/buildd/eclipse-mylyn-tasks-github-3.3.0/debian/.eclipse-build/org.eclipse.mylyn.github.ui/@dot

....

    [javac] 29. ERROR in /tmp/buildd/eclipse-mylyn-tasks-github-3.3.0/debian/.eclipse-build/org.eclipse.mylyn.github.ui/src/org/eclipse/mylyn/internal/github/ui/RepositorySelectionWizardPage.java (at line 27)
    [javac] import org.eclipse.egit.ui.internal.FilteredCheckboxTree;
    [javac] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    [javac] The import org.eclipse.egit.ui.internal.FilteredCheckboxTree cannot be resolved
    [javac] ----------
    [javac] 30. ERROR in /tmp/buildd/eclipse-mylyn-tasks-github-3.3.0/debian/.eclipse-build/org.eclipse.mylyn.github.ui/src/org/eclipse/mylyn/internal/github/ui/RepositorySelectionWizardPage.java (at line 184)
    [javac] private FilteredCheckboxTree tree;
    [javac] ^^^^^^^^^^^^^^^^^^^^
    [javac] FilteredCheckboxTree cannot be resolved to a type

etc.

Full build log:
https://reproducible.debian.net/rb-pkg/testing/amd64/eclipse-mylyn-tasks-github.html

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 3.19.0-21-generic (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)