Convert ASSERT(foo) to DCHECK(foo) in platform/audio

third_party/WebKit/Source/platform/audio/ffmpeg/FFTFrameFFMPEG.cpp

Index: third_party/WebKit/Source/platform/audio/ffmpeg/FFTFrameFFMPEG.cpp
diff --git a/third_party/WebKit/Source/platform/audio/ffmpeg/FFTFrameFFMPEG.cpp b/third_party/WebKit/Source/platform/audio/ffmpeg/FFTFrameFFMPEG.cpp
index 821b9001855073d52050f9223392785d7bd455cd..8c6c046d8c8a6563c37d2ad4f95ecb613c5110d1 100644
--- a/third_party/WebKit/Source/platform/audio/ffmpeg/FFTFrameFFMPEG.cpp
+++ b/third_party/WebKit/Source/platform/audio/ffmpeg/FFTFrameFFMPEG.cpp
@@ -155,7 +155,7 @@ RDFTContext* FFTFrame::contextForSize(unsigned fftSize, int trans) {
   // FFTFrames of the same size.  But FFmpeg's RDFT uses a scratch buffer
   // inside the context and so they are not thread-safe.  We could improve this
   // by sharing the FFTFrames on a per-thread basis.
-  ASSERT(fftSize);
+  DCHECK(fftSize);
   int pow2size = static_cast<int>(log2(fftSize));
   ASSERT(pow2size < kMaxFFTPow2Size);