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

Source/modules/webaudio/DefaultAudioDestinationNode.h

Index: Source/modules/webaudio/DefaultAudioDestinationNode.h
diff --git a/Source/modules/webaudio/DefaultAudioDestinationNode.h b/Source/modules/webaudio/DefaultAudioDestinationNode.h
index 0f195975697def46234486fea4e5da256bc963bc..08f9c8882c48df29b4860cdd704e956540f3d252 100644
--- a/Source/modules/webaudio/DefaultAudioDestinationNode.h
+++ b/Source/modules/webaudio/DefaultAudioDestinationNode.h
@@ -38,12 +38,12 @@ class DefaultAudioDestinationNode : public AudioDestinationNode {
 public:
     static PassRefPtr<DefaultAudioDestinationNode> create(AudioContext* context)
     {
-        return adoptRef(new DefaultAudioDestinationNode(context));     
+        return adoptRef(new DefaultAudioDestinationNode(context));
     }
 
     virtual ~DefaultAudioDestinationNode();
-    
-    // AudioNode   
+
+    // AudioNode
     virtual void initialize() OVERRIDE;
     virtual void uninitialize() OVERRIDE;
     virtual void setChannelCount(unsigned long, ExceptionState&) OVERRIDE;
@@ -52,7 +52,7 @@ public:
     virtual void enableInput(const String& inputDeviceId) OVERRIDE;
     virtual void startRendering() OVERRIDE;
     virtual unsigned long maxChannelCount() const OVERRIDE;
-    
+
 private:
     explicit DefaultAudioDestinationNode(AudioContext*);
     void createDestination();