media: Add out-of-line copy ctors for complex classes.

media/cdm/player_tracker_impl.cc

 // Copyright 2014 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.
 
 #include "media/cdm/player_tracker_impl.h"
 
 #include <utility>
 
 #include "base/stl_util.h"
 
 namespace media {
 
 PlayerTrackerImpl::PlayerCallbacks::PlayerCallbacks(
     const base::Closure& new_key_cb,
     const base::Closure& cdm_unset_cb)
     : new_key_cb(new_key_cb), cdm_unset_cb(cdm_unset_cb) {}
 
+PlayerTrackerImpl::PlayerCallbacks::PlayerCallbacks(
+    const PlayerCallbacks& other) = default;
+
 PlayerTrackerImpl::PlayerCallbacks::~PlayerCallbacks() {
 }
 
 PlayerTrackerImpl::PlayerTrackerImpl() : next_registration_id_(1) {
 }
 
 PlayerTrackerImpl::~PlayerTrackerImpl() {}
 
 int PlayerTrackerImpl::RegisterPlayer(const base::Closure& new_key_cb,
                                       const base::Closure& cdm_unset_cb) {
@@ skipping 32 matching lines @@
     base::AutoLock lock(lock_);
     for (const auto& entry : player_callbacks_map_)
       cdm_unset_callbacks.push_back(entry.second.cdm_unset_cb);
   }
 
   for (const auto& cb : cdm_unset_callbacks)
     cb.Run();
 }
 
 }  // namespace media