Remove dead splice_timestamp() field from DecoderBuffer.

media/remoting/rpc.proto

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Protocol buffer for Media Remoting.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
 package media.remoting.pb;
 
 // DecoderBuffer information which will be sent using RTP packets. The actual
 // decoder buffer is not included in this proto data structure.
 message DecoderBuffer {
   optional int64 timestamp_usec = 1;
   optional int64 duration_usec = 2;
   optional bool is_key_frame = 3;
   optional DecryptConfig decrypt_config = 4;
   optional int64 front_discard_usec = 5;
   optional int64 back_discard_usec = 6;
-  optional int64 splice_timestamp_usec = 7;
+  optional int64 splice_timestamp_usec = 7 [deprecated=true];
   optional bytes side_data = 8;
   // To distinguish from valid 0-length buffers
   optional bool is_eos = 9;
 }
 
 // Utility proto data structure
 message Size {
   optional int32 width = 1;
   optional int32 height = 2;
 }
@@ skipping 561 matching lines @@
 
     // RPC_CDMC_ONSESSIONMESSAGE
     CdmClientOnSessionMessage cdmclient_onsessionmessage_rpc = 601;
     // RPC_CDMC_ONSESSIONKEYSCHANGE
     CdmClientOnSessionKeysChange cdmclient_onsessionkeychange_rpc = 602;
     // RPC_CDMC_ONSESSIONEXPIRATIONUPDATE
     CdmClientOnSessionExpirationUpdate cdmclient_onsessionexpirationupdate_rpc =
         603;
   };
 }