- The need to pass a Clock is pretty much only for testing, so
make the constructor that takes one package private + use
the system clock for public constructors.
- Add default timeout values.
- Also make sure we set Content-Type in all license requests,
since when using Cronet the stack requires it to be set.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=131404298
