Enable precompiled headers for Blink on Windows.

third_party/WebKit/Source/core/xml/XPathGrammar.y

 /*
  * Copyright 2005 Frerich Raabe <raabe@kde.org>
  * Copyright (C) 2006 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 376 matching lines @@
     LocationPath
     {
         $$ = $1;
     }
     |
     FilterExpr
     |
     FilterExpr '/' RelativeLocationPath
     {
         $3->setAbsolute(true);
-        $$ = new Path($1, $3);
+        $$ = new blink::XPath::Path($1, $3);
     }
     |
     FilterExpr DescendantOrSelf RelativeLocationPath
     {
         $3->insertFirstStep($2);
         $3->setAbsolute(true);
-        $$ = new Path($1, $3);
+        $$ = new blink::XPath::Path($1, $3);
     }
     ;
 
 FilterExpr:
     PrimaryExpr
     |
     PrimaryExpr PredicateList
     {
-        $$ = new Filter($1, *$2);
+        $$ = new blink::XPath::Filter($1, *$2);
     }
     ;
 
 OrExpr:
     AndExpr
     |
     OrExpr OR AndExpr
     {
         $$ = new LogicalOp(LogicalOp::OP_Or, $1, $3);
     }
@@ skipping 53 matching lines @@
     UnionExpr
     |
     MINUS UnaryExpr
     {
         $$ = new Negative;
         $$->addSubExpression($2);
     }
     ;
 
 %%