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/oemcrypto/mock/src/oemcrypto_mock.cpp

@@ -39,7 +39,6 @@ static void dump_hex(std::string name, const uint8_t* vector, size_t length) {
     printf("NULL;\n");
     return;
   }
-  // TODO(fredgc): replace with HEXEncode.
   for (size_t i = 0; i < length; i++) {
     if (i == 0) {
       printf("\n     wvcdm::a2b_hex(\"");