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

6884800: (file) Path.newInputStream does not usefully implement available()
Reviewed-by: martin, chegar

6785258: Update copyright year
Summary: Update copyright for files that have been modified starting July 2008 to Dec 2008
Reviewed-by: katleman, ohair, tbell

6725399: (ch) Channels.newInputStream should check for null
Summary: update to check null arg for all Channels methods
Reviewed-by: alanb

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