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It's just a shorthand to refer to the overall group of authors since Google only owns a large portion of the code rather than all of it. It'd be very impractical to list out each owner especially as it moves across files and this makes it much easier to comply with the license.
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The header at the top of the files is also just a reference to the actual copyright notice / license. It's strictly required to have the actual notice intact. The file headers are only there to make it easier to follow the licensing. It's the LICENSE file that actually matters.
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In this case the individual files refer to an actual notice elsewhere instead of having a bunch of them for each file. They distribute each notice variation with software like Android. If a project has 10 files different variations of the notice, they actually ship 10 of them.
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