Change the cpp wrappers of audio input/video capture to use CompletionCallbackWithOutput.

ppapi/cpp/array_output.cc

 // Copyright (c) 2012 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 "ppapi/cpp/array_output.h"
 
 #include "ppapi/cpp/logging.h"
 
 namespace pp {
 
 // static
 void* ArrayOutputAdapterBase::GetDataBufferThunk(void* user_data,
                                                  uint32_t element_count,
                                                  uint32_t element_size) {
   return static_cast<ArrayOutputAdapterBase*>(user_data)->
       GetDataBuffer(element_count, element_size);
 }
 
 VarArrayOutputAdapterWithStorage::VarArrayOutputAdapterWithStorage()
     : ArrayOutputAdapter<PP_Var>() {
   set_output(&temp_storage_);
 }
 
+VarArrayOutputAdapterWithStorage::~VarArrayOutputAdapterWithStorage() {
+  if (!temp_storage_.empty()) {
+    // An easy way to release the var references held by this object.
+    output();
+  }
+}
+
 std::vector<Var>& VarArrayOutputAdapterWithStorage::output() {
   PP_DCHECK(output_storage_.empty());
 
   output_storage_.reserve(temp_storage_.size());
   for (size_t i = 0; i < temp_storage_.size(); i++)
     output_storage_.push_back(Var(PASS_REF, temp_storage_[i]));
   temp_storage_.clear();
   return output_storage_;
 }
 
 }  // namespace pp