Fix WHITESPACE issues in the CSS grammar.

Source/core/css/CSSGrammar.y.in

 /*
  *  Copyright (C) 2002-2003 Lars Knoll (knoll@kde.org)
  *  Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  *  Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *  Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  *  Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
@@ skipping 1077 matching lines @@
     }
 ;
 
 before_region_rule:
     /* empty */ {
         parser->startRuleHeader(CSSRuleSourceData::REGION_RULE);
     }
     ;
 
 region:
-    before_region_rule WEBKIT_REGION_RULE_SYM WHITESPACE region_selector at_rule_header_end '{' at_rule_body_start maybe_space region_block_rule_body closing_brace {
+    before_region_rule WEBKIT_REGION_RULE_SYM maybe_space region_selector at_rule_header_end '{' at_rule_body_start maybe_space region_block_rule_body closing_brace {
         $$ = parser->createRegionRule($4, $9);
     }
   | before_region_rule WEBKIT_REGION_RULE_SYM at_rule_recovery {
         $$ = 0;
         parser->endRuleBody(true);
     }
 ;
 
 before_filter_rule:
     /* empty */ {
         parser->startRuleHeader(CSSRuleSourceData::FILTER_RULE);
         parser->m_inFilterRule = true;
     }
     ;
 
 filter:
-    before_filter_rule WEBKIT_FILTER_RULE_SYM WHITESPACE IDENT at_rule_header_end_maybe_space
+    before_filter_rule WEBKIT_FILTER_RULE_SYM maybe_space IDENT at_rule_header_end_maybe_space
     '{' at_rule_body_start maybe_space_before_declaration declaration_list closing_brace {
         parser->m_inFilterRule = false;
         $$ = parser->createFilterRule($4);
     }
   | before_filter_rule WEBKIT_FILTER_RULE_SYM at_rule_recovery {
         $$ = 0;
     }
     ;
 
 combinator:
@@ skipping 645 matching lines @@
   unary_term
   | VARFUNCTION maybe_space IDENT closing_parenthesis {
       $$.id = CSSValueInvalid;
       $$.string = $3;
       $$.unit = CSSPrimitiveValue::CSS_VARIABLE_NAME;
   }
   | unary_operator unary_term { $$ = $2; $$.fValue *= $1; }
   ;
 
 calc_func_operator:
-    WHITESPACE '+' WHITESPACE {
+    space '+' space {
         $$ = '+';
     }
-    | WHITESPACE '-' WHITESPACE {
+    | space '-' space {
         $$ = '-';
     }
     | calc_maybe_space '*' maybe_space {
         $$ = '*';
     }
     | calc_maybe_space '/' maybe_space {
         $$ = '/';
     }
   ;
 
@@ skipping 139 matching lines @@
 
 rule_error_recovery:
     /* empty */
   | rule_error_recovery error
   | rule_error_recovery invalid_square_brackets_block
   | rule_error_recovery invalid_parentheses_block
     ;
 
 %%