net: Avoid recursion in URLRequestJob::ReadFilteredData.

net/http/http_transaction_unittest.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_transaction_unittest.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 267 matching lines @@
     return false;
 
   // Only mock auth when the test asks for it.
   return request_->extra_headers.HasHeader("X-Require-Mock-Auth");
 }
 
 int MockNetworkTransaction::Read(net::IOBuffer* buf, int buf_len,
                                  const net::CompletionCallback& callback) {
   int data_len = static_cast<int>(data_.size());
   int num = std::min(buf_len, data_len - data_cursor_);
+  if (test_mode_ & TEST_MODE_SLOW_READ)
+    num = std::min(num, 1);
   if (num) {
     memcpy(buf->data(), data_.data() + data_cursor_, num);
     data_cursor_ += num;
   }
   if (test_mode_ & TEST_MODE_SYNC_NET_READ)
     return num;
 
   CallbackLater(callback, num);
   return net::ERR_IO_PENDING;
 }
@@ skipping 194 matching lines @@
 
     if (rv > 0)
       content.append(buf->data(), rv);
     else if (rv < 0)
       return rv;
   } while (rv > 0);
 
   result->swap(content);
   return net::OK;
 }