Clean comments, namespace, and variable names

This CL removes TODOs and email addresses from comments, unifies some
namespaces and cleans a few variable names.  It is a copy of multiple
CLs on the widevine side.

Change-Id: I1bb649096476a5001a56d746427399de6a88ff69

libwvdrmengine/cdm/core/src/license.cpp

@@ -202,7 +202,6 @@ bool CdmLicense::PrepareKeyRequest(const InitializationData& init_data,
     return PrepareServiceCertificateRequest(signed_request, server_url);
   }
 
-  // TODO(gmorgan): Request ID owned by session?
   std::string request_id;
   session_->GenerateRequestId(request_id);