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

Source/modules/webaudio/AsyncAudioDecoder.h

Index: Source/modules/webaudio/AsyncAudioDecoder.h
diff --git a/Source/modules/webaudio/AsyncAudioDecoder.h b/Source/modules/webaudio/AsyncAudioDecoder.h
index fedb105b1faf675c328fdb9430b0692e314346d7..ca663ea64264a2af2a6f3f901ff2a517a9502c93 100644
--- a/Source/modules/webaudio/AsyncAudioDecoder.h
+++ b/Source/modules/webaudio/AsyncAudioDecoder.h
@@ -56,7 +56,7 @@ private:
         static PassOwnPtr<DecodingTask> create(ArrayBuffer* audioData, float sampleRate, PassRefPtr<AudioBufferCallback> successCallback, PassRefPtr<AudioBufferCallback> errorCallback);
 
         void decode();
-        
+
     private:
         DecodingTask(ArrayBuffer* audioData, float sampleRate, PassRefPtr<AudioBufferCallback> successCallback, PassRefPtr<AudioBufferCallback> errorCallback);
 
@@ -75,7 +75,7 @@ private:
         RefPtr<AudioBufferCallback> m_errorCallback;
         RefPtr<AudioBuffer> m_audioBuffer;
     };
-    
+
     static void threadEntry(void* threadData);
     void runLoop();