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

Source/wtf/Threading.cpp

Index: Source/wtf/Threading.cpp
diff --git a/Source/wtf/Threading.cpp b/Source/wtf/Threading.cpp
index 263799706588d7a40f6a05541d43fbe88c07a0c6..23e7df192bd7a1930416d0b86cdbf5e55f8df871 100644
--- a/Source/wtf/Threading.cpp
+++ b/Source/wtf/Threading.cpp
@@ -6,10 +6,10 @@
  * 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.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED