GIT_SILENT: Update source code license headers.
Thanks to Eric Newberry (from Google Code-In) for running the heavy lifting on this. I made some other corrections since we're touching all the source anyways (e.g. fixing my email addresses), fixing the encoding of Richard Lärkäng's name, and I've also chosen to avoid the fancy box-shaped comments so that there's no issue with trailing spaces/tabs. REVIEW:114216
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