Make the copy of GURL in src/url buildable as a component build. (try 2)

url/gurl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef URL_GURL_H_
 #define URL_GURL_H_
 
 #include <iosfwd>
 #include <string>
 
 #include "base/string16.h"
 #include "url/url_canon.h"
 #include "url/url_canon_stdstring.h"
+#include "url/url_export.h"
 #include "url/url_parse.h"
 
-class GURL {
+class URL_EXPORT GURL {
  public:
   typedef url_canon::StdStringReplacements<std::string> Replacements;
   typedef url_canon::StdStringReplacements<string16> ReplacementsW;
 
   // Creates an empty, invalid URL.
   GURL();
 
   // Copy construction is relatively inexpensive, with most of the time going
   // to reallocating the string. It does not re-parse.
   GURL(const GURL& other);
 
   // The narrow version requires the input be UTF-8. Invalid UTF-8 input will
   // result in an invalid URL.
   //
   // The wide version should also take an encoding parameter so we know how to
   // encode the query parameters. It is probably sufficient for the narrow
   // version to assume the query parameter encoding should be the same as the
   // input encoding.
-  explicit GURL(const std::string& url_string
-                /*, output_param_encoding*/);
-  explicit GURL(const string16& url_string
-                /*, output_param_encoding*/);
+  explicit GURL(const std::string& url_string /*, output_param_encoding*/);
+  explicit GURL(const string16& url_string /*, output_param_encoding*/);
 
   // Constructor for URLs that have already been parsed and canonicalized. This
   // is used for conversions from KURL, for example. The caller must supply all
   // information associated with the URL, which must be correct and consistent.
   GURL(const char* canonical_spec, size_t canonical_spec_len,
        const url_parse::Parsed& parsed, bool is_valid);
 
   ~GURL();
 
   GURL& operator=(const GURL& other);
@@ skipping 305 matching lines @@
   // Identified components of the canonical spec.
   url_parse::Parsed parsed_;
 
   // Used for nested schemes [currently only filesystem:].
   GURL* inner_url_;
 
   // TODO bug 684583: Add encoding for query params.
 };
 
 // Stream operator so GURL can be used in assertion statements.
-std::ostream& operator<<(std::ostream& out, const GURL& url);
+URL_EXPORT std::ostream& operator<<(std::ostream& out, const GURL& url);
 
 #endif  // URL_GURL_H_