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

Source/core/page/DOMSelection.h

Index: Source/core/page/DOMSelection.h
diff --git a/Source/core/page/DOMSelection.h b/Source/core/page/DOMSelection.h
index da36bb2ccd0e1ec822c60d24add2e24da8a13dff..e95d000ce7d26bda06e0fa524be6600fc4cac4bc 100644
--- a/Source/core/page/DOMSelection.h
+++ b/Source/core/page/DOMSelection.h
@@ -7,13 +7,13 @@
  * 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