Correct handling of ERR_CACHE_LOCK_TIMEOUT for read only transactions.

net/http/http_cache_transaction.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/http/http_cache_transaction.h"
 
 #include "build/build_config.h"  // For OS_POSIX
 
 #if defined(OS_POSIX)
 #include <unistd.h>
@@ skipping 1142 matching lines @@
 
   // If there is a failure, the cache should have taken care of new_entry_.
   new_entry_ = NULL;
 
   if (result == ERR_CACHE_RACE) {
     next_state_ = STATE_INIT_ENTRY;
     return OK;
   }
 
   if (result == ERR_CACHE_LOCK_TIMEOUT) {
+    if (mode_ == READ)
+      return ERR_CACHE_MISS;
+
     // The cache is busy, bypass it for this transaction.
     mode_ = NONE;
     next_state_ = STATE_SEND_REQUEST;
     if (partial_) {
       partial_->RestoreHeaders(&custom_request_->extra_headers);
       partial_.reset();
     }
     return OK;
   }
 
@@ skipping 1819 matching lines @@
     default:
       NOTREACHED();
   }
 }
 
 void HttpCache::Transaction::OnIOComplete(int result) {
   DoLoop(result);
 }
 
 }  // namespace net