Coverity: Fix several pass-by-values.

webkit/appcache/view_appcache_internals_job.cc

 // Copyright (c) 2012 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.
 
 #include <algorithm>
 #include <string>
 
 #include "webkit/appcache/view_appcache_internals_job.h"
 
 #include "base/base64.h"
@@ skipping 258 matching lines @@
                  std::string* out) {
   out->append("<hr><pre>");
   base::StringAppendF(out, "Showing %d of %d bytes\n\n",
                       static_cast<int>(buf_len), static_cast<int>(total_len));
   net::ViewCacheHelper::HexDump(buf, buf_len, out);
   if (buf_len < total_len)
     out->append("\nNote: data is truncated...");
   out->append("</pre>");
 }
 
-GURL DecodeBase64URL(const std::string base64) {
+GURL DecodeBase64URL(const std::string& base64) {
   std::string url;
   base::Base64Decode(base64, &url);
   return GURL(url);
 }
 
 bool ParseQuery(const std::string& query,
                 std::string* command, std::string* value) {
   size_t position = query.find("=");
   if (position == std::string::npos)
     return false;
@@ skipping 334 matching lines @@
     return new ViewEntryJob(request, service,
                             DecodeBase64URL(tokens[0]),  // manifest url
                             DecodeBase64URL(tokens[1]),  // entry url
                             response_id, group_id);
   }
 
   return new RedirectToMainPageJob(request, service);
 }
 
 }  // namespace appcache