Add a CHECK to help track down the crash in http://crbug.com/49862....

net/http/http_network_transaction.cc

 // Copyright (c) 2010 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/http/http_network_transaction.h"
 
 #include <set>
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 889 matching lines @@
   }
 
   if ((!ssl_started && result < 0 &&
        alternate_protocol_mode_ == kUsingAlternateProtocol) ||
       result == ERR_NPN_NEGOTIATION_FAILED) {
     // Mark the alternate protocol as broken and fallback.
     MarkBrokenAlternateProtocolAndFallback();
     return OK;
   }
 
-  if (result < 0 && !ssl_started)
+  if (result < 0 && !ssl_started) {
+    // A temporary CHECK for tracking down http://crbug.com/49862.
+    CHECK(!IsCertificateError(result));
     return ReconsiderProxyAfterError(result);
+  }
   establishing_tunnel_ = false;
 
   if (connection_->socket()) {
     LogHttpConnectedMetrics(*connection_);
 
     // Set the reused_socket_ flag to indicate that we are using a keep-alive
     // connection.  This flag is used to handle errors that occur while we are
     // trying to reuse a keep-alive connection.
     reused_socket_ = connection_->is_reused();
     // TODO(vandebo) should we exclude SPDY in the following if?
@@ skipping 900 matching lines @@
     default:
       description = StringPrintf("Unknown state 0x%08X (%u)", state, state);
       break;
   }
   return description;
 }
 
 #undef STATE_CASE
 
 }  // namespace net