Make SharedMemory track the size that was actually mapped

content/browser/renderer_host/media/audio_input_sync_writer.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 "content/browser/renderer_host/media/audio_input_sync_writer.h"
 
 #include <algorithm>
 
 #include "base/process_util.h"
 #include "base/shared_memory.h"
 
 namespace content {
 
 AudioInputSyncWriter::AudioInputSyncWriter(
     base::SharedMemory* shared_memory,
     int shared_memory_segment_count)
     : shared_memory_(shared_memory),
       shared_memory_segment_count_(shared_memory_segment_count),
       current_segment_id_(0) {
   DCHECK_GT(shared_memory_segment_count, 0);
-  DCHECK_EQ(shared_memory->created_size() % shared_memory_segment_count, 0u);
+  DCHECK_EQ(shared_memory->requested_size() % shared_memory_segment_count, 0u);
   shared_memory_segment_size_ =
-      shared_memory->created_size() / shared_memory_segment_count;
+      shared_memory->requested_size() / shared_memory_segment_count;
 }
 
 AudioInputSyncWriter::~AudioInputSyncWriter() {}
 
 // TODO(henrika): Combine into one method (including Write).
 void AudioInputSyncWriter::UpdateRecordedBytes(uint32 bytes) {
   socket_->Send(&bytes, sizeof(bytes));
 }
 
 uint32 AudioInputSyncWriter::Write(
@@ skipping 40 matching lines @@
     base::ProcessHandle process_handle,
     base::FileDescriptor* foreign_handle) {
   foreign_handle->fd = foreign_socket_->handle();
   foreign_handle->auto_close = false;
   return (foreign_handle->fd != -1);
 }
 
 #endif
 
 }  // namespace content