remove whitespace

Change-Id: I81a24a7affa7dffcc3dac65248444679c3c49925
remove empty comment

Change-Id: Ie5f5e6c92845933403b2371400fcdba10eba1a42
fix the scale size of bubble

Change-Id: I633e2ff112e21488b9d17ffbb59a926b22b51952