Replace a DCHECK with static_assert

webrtc/modules/audio_processing/include/audio_processing.h

Index: webrtc/modules/audio_processing/include/audio_processing.h
diff --git a/webrtc/modules/audio_processing/include/audio_processing.h b/webrtc/modules/audio_processing/include/audio_processing.h
index 44ff7327ffeb849184869c7bfadc921438093821..aab20b293e4871a68116c8986260ace46f9c0377 100644
--- a/webrtc/modules/audio_processing/include/audio_processing.h
+++ b/webrtc/modules/audio_processing/include/audio_processing.h
@@ -498,9 +498,15 @@ class AudioProcessing {
     kSampleRate48kHz = 48000
   };
 
-  static const int kNativeSampleRatesHz[];
-  static const size_t kNumNativeSampleRates;
-  static const int kMaxNativeSampleRateHz;
+  // TODO(kwiberg): We currently need to support a compiler (Visual C++) that
+  // complains if we don't explicitly state the size of the array here. Remove
+  // the size when that's no longer the case.
+  static constexpr int kNativeSampleRatesHz[4] = {
+      kSampleRate8kHz, kSampleRate16kHz, kSampleRate32kHz, kSampleRate48kHz};
+  static constexpr size_t kNumNativeSampleRates =
+      arraysize(kNativeSampleRatesHz);
+  static constexpr int kMaxNativeSampleRateHz =
+      kNativeSampleRatesHz[kNumNativeSampleRates - 1];
 
   static const int kChunkSizeMs = 10;
 };