Remove renewal related expectations from WvCdmStreamingPstTest. Also clean up the code in cdm_extended_duration_test.cpp. Bug: 19534907 Merged from Widevine CDM repo: https://widevine-internal-review.googlesource.com/#/c/13842/ Change-Id: I89f9aafd80c8867af541b29bc8a6778f53a8b7e6