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

Source/wtf/text/AtomicStringHash.h

Index: Source/wtf/text/AtomicStringHash.h
diff --git a/Source/wtf/text/AtomicStringHash.h b/Source/wtf/text/AtomicStringHash.h
index 58a986a0d07ed237cf8917dd5e86e8cd0808b416..96692067a3fcac249fb36ab625ac8471f81458cb 100644
--- a/Source/wtf/text/AtomicStringHash.h
+++ b/Source/wtf/text/AtomicStringHash.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 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