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

Source/bindings/v8/custom/V8AudioBufferSourceNodeCustom.cpp

 /*
  * Copyright (C) 2011, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 30 matching lines @@
     AudioBufferSourceNode* imp = V8AudioBufferSourceNode::toNative(holder);
 
     AudioBuffer* buffer = 0;
     if (V8AudioBuffer::HasInstance(value, info.GetIsolate(), worldType(info.GetIsolate()))) {
         buffer = V8AudioBuffer::toNative(value->ToObject());
         if (buffer && !imp->setBuffer(buffer)) {
             throwTypeError("AudioBuffer unsupported number of channels", info.GetIsolate());
             return;
         }
     }
-    
+
     if (!buffer) {
         throwTypeError("Value is not of type AudioBuffer", info.GetIsolate());
         return;
     }
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)