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

media/audio/win/audio_low_latency_input_win_unittest.cc

Index: media/audio/win/audio_low_latency_input_win_unittest.cc
diff --git a/media/audio/win/audio_low_latency_input_win_unittest.cc b/media/audio/win/audio_low_latency_input_win_unittest.cc
index 8f6b3ce2daa1f062a2e0f414ec54d4e19e123a81..4f0165484505b619c20a34d062807446eeaac6f4 100644
--- a/media/audio/win/audio_low_latency_input_win_unittest.cc
+++ b/media/audio/win/audio_low_latency_input_win_unittest.cc
@@ -49,9 +49,9 @@ class MockAudioInputCallback : public AudioInputStream::AudioInputCallback {
 class FakeAudioInputCallback : public AudioInputStream::AudioInputCallback {
  public:
   FakeAudioInputCallback()
-      : error_(false),
+      : num_received_audio_frames_(0),
         data_event_(false, false),
-        num_received_audio_frames_(0) {}
+        error_(false) {}
 
   bool error() const { return error_; }
   int num_received_audio_frames() const { return num_received_audio_frames_; }