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

webrtc/test/fake_audio_device.cc

Index: webrtc/test/fake_audio_device.cc
diff --git a/webrtc/test/fake_audio_device.cc b/webrtc/test/fake_audio_device.cc
index 435c53f8783fc7f9ecb6bd8d149d9c0e6cd4215f..43c2933ba76b9ae3a220170fad05870c60043950 100644
--- a/webrtc/test/fake_audio_device.cc
+++ b/webrtc/test/fake_audio_device.cc
@@ -39,8 +39,7 @@ FakeAudioDevice::FakeAudioDevice(Clock* clock,
   memset(captured_audio_, 0, sizeof(captured_audio_));
   memset(playout_buffer_, 0, sizeof(playout_buffer_));
   // Open audio input file as read-only and looping.
-  EXPECT_EQ(0, input_stream_->OpenFile(filename.c_str(), true, true))
-      << filename;
+  EXPECT_TRUE(input_stream_->OpenFile(filename.c_str(), true)) << filename;
 }
 
 FakeAudioDevice::~FakeAudioDevice() {