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

Source/wtf/text/Base64.cpp

 /*
    Copyright (C) 2000-2001 Dawit Alemayehu <adawit@kde.org>
    Copyright (C) 2006 Alexey Proskuryakov <ap@webkit.org>
    Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
    Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License (LGPL)
    version 2 as published by the Free Software Foundation.
 
@@ skipping 164 matching lines @@
         } else if (charactersPolicy == Base64FailOnInvalidCharacter || (charactersPolicy == Base64IgnoreWhitespace && !isSpaceOrNewline(ch)))
             return false;
     }
 
     if (!outLength)
         return !sawEqualsSign;
 
     // Valid data is (n * 4 + [0,2,3]) characters long.
     if ((outLength % 4) == 1)
         return false;
-    
+
     // 4-byte to 3-byte conversion
     outLength -= (outLength + 3) / 4;
     if (!outLength)
         return false;
 
     unsigned sidx = 0;
     unsigned didx = 0;
     if (outLength > 1) {
         while (didx < outLength - 2) {
             out[didx] = (((out[sidx] << 2) & 255) | ((out[sidx + 1] >> 4) & 003));
@@ skipping 24 matching lines @@
 bool base64Decode(const String& in, Vector<char>& out, Base64InvalidCharactersPolicy charactersPolicy, Base64PaddingValidationPolicy paddingPolicy)
 {
     if (in.isEmpty())
         return base64DecodeInternal<LChar>(0, 0, out, charactersPolicy, paddingPolicy);
     if (in.is8Bit())
         return base64DecodeInternal<LChar>(in.characters8(), in.length(), out, charactersPolicy, paddingPolicy);
     return base64DecodeInternal<UChar>(in.characters16(), in.length(), out, charactersPolicy, paddingPolicy);
 }
 
 } // namespace WTF