Update git submodules
Update git submodules

* Update plugins/delete-project from branch 'stable-3.0'
  to 195458f8d39ed40cc84f9730193da9571551e104
  - Remove check whether window.Polymer is defined
    
    This check was done to protect GWT UI page from loading PG plugin. Given
    that GWT UI is removed, this check is now obsolete and can be removed.
    
    Change-Id: If8e9eb6fccd889de11e886903c893f5f47d02830
    
  - Remove GWT UI
    
    Change-Id: Ie48f4348b17cb8f7ac481d49dd5664a81c4fed21
    
  - Revert "Configure whether to allow user to select preserve"
    
    This feature was only implemented in GWT UI, that is going to be removed
    in follow-up change.
    
    This reverts commit 8f66a733f0a904f3d13be30b5c63c49723ec20aa.
    
    Change-Id: I6d14a480996594b929793ba099780f1a6047892a
    
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