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

Source/core/platform/FileChooser.h

Index: Source/core/platform/FileChooser.h
diff --git a/Source/core/platform/FileChooser.h b/Source/core/platform/FileChooser.h
index de1ffb7f05f4063f00ed293d199fefd645e676d0..95fabf09be46e0aca36789e3b5c85bfd3e3edf9b 100644
--- a/Source/core/platform/FileChooser.h
+++ b/Source/core/platform/FileChooser.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