Fix trailing whitespace in .cpp, .h, and .idl files

Source/core/loader/DocumentWriter.h

Index: Source/core/loader/DocumentWriter.h
diff --git a/Source/core/loader/DocumentWriter.h b/Source/core/loader/DocumentWriter.h
index 35667be2805a7ff158f453a211ba7c12c775f1a0..f3da31f112b6571752d0006d2e8893f43dce21f1 100644
--- a/Source/core/loader/DocumentWriter.h
+++ b/Source/core/loader/DocumentWriter.h
@@ -6,13 +6,13 @@
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer. 
+ *     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
- *     documentation and/or other materials provided with the distribution. 
+ *     documentation and/or other materials provided with the distribution.
  * 3.  Neither the name of Adam Barth. ("Adam Barth") nor the names of
  *     its contributors may be used to endorse or promote products derived
- *     from this software without specific prior written permission. 
+ *     from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
@@ -56,7 +56,7 @@ public:
     void replaceDocument(const String&, Document* ownerDocument);
 
     void addData(const char* bytes, size_t length);
-    
+
     const String& mimeType() const { return m_decoderBuilder.mimeType(); }
     const String& encoding() const { return m_decoderBuilder.encoding(); }
     bool encodingWasChosenByUser() const { return m_decoderBuilder.encodingWasChosenByUser(); }