Merge from Widevine repo of http://go/wvgerrit/98264
The generic decrypt tests changed the variable controlling buffer size
after it initialized the buffer -- so the buffer was not changed. This
CL fixes that.
Also, RefreshLargeBuffer changed the size of the license message
buffer, not the renewal message buffer.
Bug: 153590142
Test: ran unit tests on taimen
Change-Id: Ib01b411478a181ba956ac2e23c03634a2d971cc0
eb227bdc61