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

Source/core/loader/DocumentWriter.cpp

Index: Source/core/loader/DocumentWriter.cpp
diff --git a/Source/core/loader/DocumentWriter.cpp b/Source/core/loader/DocumentWriter.cpp
index 7230b91b51d550a74e0aeae63cc6087c6d251e9e..566351d30a906c1015606baf0ceb224a0d8a666d 100644
--- a/Source/core/loader/DocumentWriter.cpp
+++ b/Source/core/loader/DocumentWriter.cpp
@@ -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 Apple Computer, Inc. ("Apple") 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
@@ -111,7 +111,7 @@ void DocumentWriter::end()
     ASSERT(m_document);
 
     // http://bugs.webkit.org/show_bug.cgi?id=10854
-    // The frame's last ref may be removed and it can be deleted by checkCompleted(), 
+    // The frame's last ref may be removed and it can be deleted by checkCompleted(),
     // so we'll add a protective refcount
     RefPtr<Frame> protector(m_document->frame());