Fix trailing whitespace in .cpp, .h, and .idl files (ex. Source/core)

Source/modules/webaudio/OfflineAudioCompletionEvent.h

Index: Source/modules/webaudio/OfflineAudioCompletionEvent.h
diff --git a/Source/modules/webaudio/OfflineAudioCompletionEvent.h b/Source/modules/webaudio/OfflineAudioCompletionEvent.h
index f0a28522fc805027dad4f9c1e9e533bde6ba7305..639744ec751b6feca338ca6633f811595d679e2b 100644
--- a/Source/modules/webaudio/OfflineAudioCompletionEvent.h
+++ b/Source/modules/webaudio/OfflineAudioCompletionEvent.h
@@ -33,12 +33,12 @@
 namespace WebCore {
 
 class AudioBuffer;
-    
+
 class OfflineAudioCompletionEvent : public Event {
 public:
     static PassRefPtr<OfflineAudioCompletionEvent> create();
     static PassRefPtr<OfflineAudioCompletionEvent> create(PassRefPtr<AudioBuffer> renderedBuffer);
-    
+
     virtual ~OfflineAudioCompletionEvent();
 
     AudioBuffer* renderedBuffer() { return m_renderedBuffer.get(); }