FileWrapper[Impl] modifications and actually remove the "Impl" class.

webrtc/modules/audio_device/audio_device_buffer.cc

Index: webrtc/modules/audio_device/audio_device_buffer.cc
diff --git a/webrtc/modules/audio_device/audio_device_buffer.cc b/webrtc/modules/audio_device/audio_device_buffer.cc
index 48ae88ee90477e7ec4b5c5b132a2840b9116c68e..4b0078ee3a1e0fd3f0e8e29596c66f3a8f667ae0 100644
--- a/webrtc/modules/audio_device/audio_device_buffer.cc
+++ b/webrtc/modules/audio_device/audio_device_buffer.cc
@@ -313,7 +313,7 @@ int32_t AudioDeviceBuffer::StartInputFileRecording(
     _recFile.Flush();
     _recFile.CloseFile();
 
-    return (_recFile.OpenFile(fileName, false, false, false));
+    return (_recFile.OpenFile(fileName, false));
 }
 
 // ----------------------------------------------------------------------------
@@ -346,7 +346,7 @@ int32_t AudioDeviceBuffer::StartOutputFileRecording(
     _playFile.Flush();
     _playFile.CloseFile();
 
-    return (_playFile.OpenFile(fileName, false, false, false));
+    return (_playFile.OpenFile(fileName, false));
 }
 
 // ----------------------------------------------------------------------------
@@ -424,7 +424,7 @@ int32_t AudioDeviceBuffer::SetRecordedBuffer(const void* audioBuffer,
         }
     }
 
-    if (_recFile.Open())
+    if (_recFile.is_open())
     {
         // write to binary file in mono or stereo (interleaved)
         _recFile.Write(&_recBuffer[0], _recSize);
@@ -572,7 +572,7 @@ int32_t AudioDeviceBuffer::GetPlayoutData(void* audioBuffer)
 
     memcpy(audioBuffer, &_playBuffer[0], _playSize);
 
-    if (_playFile.Open())
+    if (_playFile.is_open())
     {
         // write to binary file in mono or stereo (interleaved)
         _playFile.Write(&_playBuffer[0], _playSize);