clang/win: Fix most -Wwriteable-strings warnings.

net/cert/cert_verify_proc_win.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 "net/cert/cert_verify_proc_win.h"
 
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 553 matching lines @@
     return ERR_UNEXPECTED;
 
   // Build and validate certificate chain.
   CERT_CHAIN_PARA chain_para;
   memset(&chain_para, 0, sizeof(chain_para));
   chain_para.cbSize = sizeof(chain_para);
   // ExtendedKeyUsage.
   // We still need to request szOID_SERVER_GATED_CRYPTO and szOID_SGC_NETSCAPE
   // today because some certificate chains need them.  IE also requests these
   // two usages.
-  static const LPSTR usage[] = {
+  static const LPCSTR usage[] = {
     szOID_PKIX_KP_SERVER_AUTH,
     szOID_SERVER_GATED_CRYPTO,
     szOID_SGC_NETSCAPE
   };
   chain_para.RequestedUsage.dwType = USAGE_MATCH_TYPE_OR;
   chain_para.RequestedUsage.Usage.cUsageIdentifier = arraysize(usage);
   chain_para.RequestedUsage.Usage.rgpszUsageIdentifier =
       const_cast<LPSTR*>(usage);
 
   // Get the certificatePolicies extension of the certificate.
@@ skipping 211 matching lines @@
     return MapCertStatusToNetError(verify_result->cert_status);
 
   if (ev_policy_oid &&
       CheckEV(chain_context, rev_checking_enabled, ev_policy_oid)) {
     verify_result->cert_status |= CERT_STATUS_IS_EV;
   }
   return OK;
 }
 
 }  // namespace net