AI 146631: ADT #1793333: fix Widget disposed in SdkTargetSelector.

  This happens when you open the Windows > Prefs > Android panel
  while an SDK is initially loading or when you change the
  SDK in the pref panel. The target change listener was not
  properly removed since the field was not properly disposed.
  This also removed the multiple selection handling in the
  SdkTargetSelector, which we never use. In the unlikely event
  we want to use it later, it would be trivial to add it back.
  BUG=1793333

Automated import of CL 146631

0 files changed, 0 insertions, 0 deletions