Fix trailing whitespace in .cpp, .h, and .idl files

Source/core/platform/audio/AudioFileReader.h

Index: Source/core/platform/audio/AudioFileReader.h
diff --git a/Source/core/platform/audio/AudioFileReader.h b/Source/core/platform/audio/AudioFileReader.h
index bbc117f8a0f120a7004a6f8fdbefc2d91420a8bc..683eccdaf252c493290e4531e429babb9736b521 100644
--- a/Source/core/platform/audio/AudioFileReader.h
+++ b/Source/core/platform/audio/AudioFileReader.h
@@ -45,8 +45,8 @@ class AudioBus;
 PassRefPtr<AudioBus> createBusFromInMemoryAudioFile(const void* data, size_t dataSize, bool mixToMono, float sampleRate);
 
 PassRefPtr<AudioBus> createBusFromAudioFile(const char* filePath, bool mixToMono, float sampleRate);
-                                
-// May pass in 0.0 for sampleRate in which case it will use the AudioBus's sampleRate                               
+
+// May pass in 0.0 for sampleRate in which case it will use the AudioBus's sampleRate
 void writeBusToAudioFile(AudioBus* bus, const char* filePath, double fileSampleRate);
 
 } // namespace WebCore