8065998: Avoid use of _ as a one-character identifier
Reviewed-by: alanb, chegar, darcy

6943119: Rebrand source copyright notices
Reviewed-by: darcy, weijun

6791458: FileInputStream/RandomAccessFile.read leaks memory if invoked on closed stream with len > 8k
Reviewed-by: alanb
Contributed-by: jeremymanson@google.com