Remove references to policy_timers_v15

[ Merge of http://go/wvgerrit/164257 ]

Support for OEMCrypto v15 is being removed from the CDM. The
policy_timers_v15 will no longer be invoked and can be removed.

Bug: 256038127
Test: WV unit/integration tests
Change-Id: Ic3a503ef2a17223dd0bc13696960dcd6822cc343

libwvdrmengine/cdm/core/include/policy_timers_v15.h

@@ -1,97 +0,0 @@
-// Copyright 2020 Google LLC. All Rights Reserved. This file and proprietary
-// source code may only be used and distributed under the Widevine License
-// Agreement.
-
-#ifndef WVCDM_CORE_POLICY_TIMERS_V15_H_
-#define WVCDM_CORE_POLICY_TIMERS_V15_H_
-
-#include <memory>
-#include <string>
-
-#include "disallow_copy_and_assign.h"
-#include "license_protocol.pb.h"
-#include "policy_timers.h"
-#include "wv_cdm_types.h"
-
-namespace wvcdm {
-
-// OEMCrypto v16 and core messages introduced changes to how duration values
-// and clocks should be evaluated. This class provides backward compatibility
-// for licenses that do not include a core message. Durations are handled
-// in the same way as in earlier releases.
-//
-// Backward compatibility may be needed if
-//  * OEMCrypto has not been upgraded to v16
-//  * Licenses were persisted before the device was upgraded to v16
-//  * License service does not yet support core messages
-
-class PolicyTimersV15 : public PolicyTimers {
- public:
-  PolicyTimersV15() : grace_period_end_time_(0) {}
-
-  ~PolicyTimersV15() override {}
-
-  // UpdateLicense is used in handling a license response, a renewal response,
-  // or when restoring or releasing a persistent license.
-  // In a renewal the response may only contain policy fields that have
-  // changed. In this case an exact copy is not what we want to happen.
-  // |license_start_time_| is updated to the time mentioned in the renewal
-  // response.
-  // UpdateLicense will return false if |license_start_time| is not
-  // present or playback is not allowed due to policy or timer duration
-  // expiration.
-  bool UpdateLicense(int64_t current_time,
-                     const video_widevine::License& license) override;
-
-  // Call this on first decrypt to set the start of playback.
-  void BeginDecryption(int64_t current_time) override;
-
-  // for offline save and restore
-  int64_t GetGracePeriodEndTime() override { return grace_period_end_time_; }
-
-  // for offline save and restore
-  void RestorePlaybackTimes(int64_t current_time, int64_t playback_start_time,
-                            int64_t last_playback_time,
-                            int64_t grace_period_end_time) override;
-
-  bool HasPlaybackStarted(int64_t current_time) override;
-  bool HasLicenseOrRentalOrPlaybackDurationExpired(
-      int64_t current_time) override;
-  bool HasPassedGracePeriod(int64_t current_time) override;
-
-  // This returns
-  // * for streaming licenses: the time remaining on |license_duration_seconds|
-  // * for persistent licenses: the time remaining on |rental_duration_seconds|
-  //   before playback begins or the time remaining on
-  //   |playback_duration_seconds| after.
-  int64_t GetLicenseOrRentalOrPlaybackDurationRemaining(
-      int64_t current_time) override;
-  // This is only used in Query. This should return the time remaining on
-  // |license_duration_seconds| for streaming licenses and
-  // |rental_duration_seconds| for persistent licenses.
-  int64_t GetLicenseOrRentalDurationRemaining(int64_t current_time) override;
-
- protected:
-  // Gets the clock time that the license expires based on whether we have
-  // started playing.  This takes into account GetHardLicenseExpiryTime.
-  int64_t GetExpiryTime(int64_t current_time,
-                        bool ignore_soft_enforce_playback_duration) override;
-
-  int64_t GetRenewalStartTime() override { return license_start_time_; }
-
- private:
-  // Gets the clock time that the license expires.  This is the hard limit that
-  // all license types must obey at all times.
-  int64_t GetHardLicenseExpiryTime();
-  // Gets the clock time that the rental duration will expire, using the license
-  // duration if one is not present.
-  int64_t GetRentalExpiryTime();
-
-  int64_t grace_period_end_time_;
-
-  CORE_DISALLOW_COPY_AND_ASSIGN(PolicyTimersV15);
-};
-
-}  // namespace wvcdm
-
-#endif  // WVCDM_CORE_POLICY_TIMERS_V15_H_