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

Source/modules/webaudio/MediaElementAudioSourceNode.h

Index: Source/modules/webaudio/MediaElementAudioSourceNode.h
diff --git a/Source/modules/webaudio/MediaElementAudioSourceNode.h b/Source/modules/webaudio/MediaElementAudioSourceNode.h
index 30c247b0d654079cc7010a218e99f281ca3e5d99..9848511cd0dff4751f1d8651341f64eb8e5c4ba4 100644
--- a/Source/modules/webaudio/MediaElementAudioSourceNode.h
+++ b/Source/modules/webaudio/MediaElementAudioSourceNode.h
@@ -38,22 +38,22 @@
 namespace WebCore {
 
 class AudioContext;
-    
+
 class MediaElementAudioSourceNode : public AudioSourceNode, public AudioSourceProviderClient {
 public:
     static PassRefPtr<MediaElementAudioSourceNode> create(AudioContext*, HTMLMediaElement*);
 
     virtual ~MediaElementAudioSourceNode();
 
-    HTMLMediaElement* mediaElement() { return m_mediaElement.get(); }                                        
+    HTMLMediaElement* mediaElement() { return m_mediaElement.get(); }
 
     // AudioNode
     virtual void process(size_t framesToProcess);
     virtual void reset();
-    
+
     // AudioSourceProviderClient
     virtual void setFormat(size_t numberOfChannels, float sampleRate);
-    
+
     void lock();
     void unlock();