Disallow the ability to load offline licenses more than once

[ Merge of http://go/wvgerrit/123263 ]

In b/65839890 we discovered that an android app loaded an offline
license more than once in a session. We did not intend to allow
this behavior but did not prohibit it. OEMCrypto v16 disallowed
this behavior at the OEMCrypto level but we worked around it
within the CDM to maintain the bad behavior. Now that we have confirmed
that the app no longer relies on that behavior, we are reverting
the CDM workaround.

Bug: 161865160
Test: WV unit/integration test, GtsMediaTestCases
      Amazon, Netflix, Google TV streaming and offline playback.
Change-Id: I31254e4c13b81587f88c6c684d08d5aa5c18e39d

libwvdrmengine/include/mapErrors-inl.h

@@ -477,8 +477,6 @@ static android::status_t mapCdmResponseType(wvcdm::CdmResponseType res) {
       return kRenewKeyError2;
     case wvcdm::RESTORE_OFFLINE_LICENSE_ERROR_2:
       return kRestoreOfflineLicenseError2;
-    case wvcdm::RESTORE_OFFLINE_LICENSE_ERROR_3:
-      return kRestoreOfflineLicenseError3;
     case wvcdm::SAMPLE_AND_SUBSAMPLE_SIZE_MISMATCH:
       return kSampleAndSubsampleSizeMismatch;
     case wvcdm::SESSION_FILE_HANDLE_INIT_ERROR: