Reviewed-by: chegar, ksrini

Summary: Minor code changes to cleanup warnings in java.util.*
Reviewed-by: mduigou, naoto, smarks
Contributed-by: NRemi Forax <forax@univ-mlv.fr>

Summary: to use new InternalError constructor with cause chainning
Reviewed-by: alanb, ksrini, xuelei, neugens
Contributed-by: sebastian.sickelmann@gmx.de

Reviewed-by: dholmes

Reviewed-by: mduigou, alanb
Contributed-by: NNeil Richards <neil.richards@ngmr.net>

Reviewed-by: darcy, lancea, alanb, briangoetz, mduigou, mchung

Reviewed-by: darcy, weijun

Reviewed-by: dl, chegar, alanb
Contributed-by: scottb@google.com

Reviewed-by: dholmes

Reviewed-by: dholmes

Reviewed-by: alanb, iris, lmalvent, bristor, peterjones, darcy, wetmore