Relax the braces style checker to allow either {} or { }.

Tools/Scripts/webkitpy/style/checkers/cpp.py

 # -*- coding: utf-8 -*-
 #
 # Copyright (C) 2009, 2010, 2012 Google Inc. All rights reserved.
 # Copyright (C) 2009 Torch Mobile Inc.
 # Copyright (C) 2009 Apple Inc. All rights reserved.
 # Copyright (C) 2010 Chris Jerdonek (cjerdonek@webkit.org)
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
@@ skipping 2059 matching lines @@
     if search(r'}else', line):
         error(line_number, 'whitespace/braces', 5,
               'Missing space before else')
 
     # You shouldn't have spaces before your brackets, except maybe after
     # 'delete []' or 'new char * []'.
     if search(r'\w\s+\[', line) and not search(r'delete\s+\[', line):
         error(line_number, 'whitespace/braces', 5,
               'Extra space before [')
 
-    # There should always be a single space in between braces on the same line.
-    if search(r'\{\}', line):
-        error(line_number, 'whitespace/braces', 5, 'Missing space inside { }.')
+    # There should always be zero or one space in between braces on the same line.
     if search(r'\{\s\s+\}', line):
         error(line_number, 'whitespace/braces', 5, 'Too many spaces inside { }.')
 
     # You shouldn't have a space before a semicolon at the end of the line.
     # There's a special case for "for" since the style guide allows space before
     # the semicolon there.
     if search(r':\s*;\s*$', line):
         error(line_number, 'whitespace/semicolon', 5,
               'Semicolon defining empty statement. Use { } instead.')
     elif search(r'^\s*;\s*$', line):
@@ skipping 1994 matching lines @@
 
     def check(self, lines):
         _process_lines(self.file_path, self.file_extension, lines,
                        self.handle_style_error, self.min_confidence)
 
 
 # FIXME: Remove this function (requires refactoring unit tests).
 def process_file_data(filename, file_extension, lines, error, min_confidence, fs=None):
     checker = CppChecker(filename, file_extension, error, min_confidence, fs)
     checker.check(lines)