clang/win: Fix warnings to prepare for building without -Wno-reorder.

media/audio/win/wavein_input_win.cc

Index: media/audio/win/wavein_input_win.cc
diff --git a/media/audio/win/wavein_input_win.cc b/media/audio/win/wavein_input_win.cc
index 6543ee5e212828bb40d35c6c42a42f845be64b12..d93d62d3a93c44eb07cbc9294c7f5216b5ddba65 100644
--- a/media/audio/win/wavein_input_win.cc
+++ b/media/audio/win/wavein_input_win.cc
@@ -27,12 +27,12 @@ PCMWaveInAudioInputStream::PCMWaveInAudioInputStream(
     const std::string& device_id)
     : state_(kStateEmpty),
       manager_(manager),
-      device_id_(device_id),
-      wavein_(NULL),
       callback_(NULL),
       num_buffers_(num_buffers),
-      buffer_(NULL),
       channels_(params.channels()),
+      device_id_(device_id),
+      wavein_(NULL),
+      buffer_(NULL),
       audio_bus_(media::AudioBus::Create(params)) {
   DCHECK_GT(num_buffers_, 0);
   format_.wFormatTag = WAVE_FORMAT_PCM;