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

Source/core/platform/chromium/ClipboardChromium.h

Index: Source/core/platform/chromium/ClipboardChromium.h
diff --git a/Source/core/platform/chromium/ClipboardChromium.h b/Source/core/platform/chromium/ClipboardChromium.h
index 893e98de767f91ceb6fb38bfd45cc270e014bd0d..9df2d140912bca348c0a6f6544bb8b8f3e1f1339 100644
--- a/Source/core/platform/chromium/ClipboardChromium.h
+++ b/Source/core/platform/chromium/ClipboardChromium.h
@@ -1,10 +1,10 @@
 // Copyright (c) 2008, Google Inc.
 // All rights reserved.
-// 
+//
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
-// 
+//
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ -14,7 +14,7 @@
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
-// 
+//
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR