Do Not Clean Up Licenses As Aggressively

(This is a merge of http://go/wvgerrit/15430)

Previously, after provisioning, any existing offline licenses would be
deleted, as they were inevitably tied to the certificate that was just
replaced. However, due to the way per-origin provisioning works on
Android, this is no longer a safe assumption. Licenses from different
origins are all stored together, so this behavior would delete all
offline licenses across all origins every time any origin is
provisioned. And it is not possible to delete only the licenses for
specific origins without changing how licenses are stored. It is too
late to change how licenses are stored in Android M, so we need to
stop proactively cleaning up licenses in this edge case for now. Once
b/23354606 is resolved, we can reinstate this clean-up and properly
only clean up the licenses associated with the origin that was just
provisioned.

Bug: 23324167
Change-Id: Ic21db8c21bdb4243266cd49020ed52287eb21d9a

libwvdrmengine/cdm/core/src/certificate_provisioning.cpp

@@ -268,7 +268,6 @@ CdmResponseType CertificateProvisioning::HandleProvisioningResponse(
     LOGE("HandleProvisioningResponse: failed to save provisioning certificate");
     return CERT_PROVISIONING_RESPONSE_ERROR_8;
   }
-  handle.DeleteAllLicenses();
 
   return NO_ERROR;
 }