Http cache: Fix the code that handles 206s when revalidating...

net/http/partial_data.cc

 // Copyright (c) 2009 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/partial_data.h"
 
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "net/base/net_errors.h"
 #include "net/disk_cache/disk_cache.h"
@@ skipping 240 matching lines @@
     return entry->WriteData(kDataStream, static_cast<int>(current_range_start_),
                             data, data_len, callback, false);
   }
 }
 
 void PartialData::OnCacheReadCompleted(int result) {
   if (result > 0) {
     current_range_start_ += result;
     cached_min_len_ -= result;
     DCHECK(cached_min_len_ >= 0);
-  } else if (!result) {
-    // TODO(rvargas): we can detect this error and make sure that we are not
-    // in a loop of failure/retry.
   }
 }
 
 void PartialData::OnNetworkReadCompleted(int result) {
   if (result > 0)
     current_range_start_ += result;
 }
 
 // Static.
 void PartialData::AddRangeHeader(int64 start, int64 end, std::string* headers) {
   DCHECK(start >= 0 || end >= 0);
   std::string my_start, my_end;
   if (start >= 0)
     my_start = Int64ToString(start);
   if (end >= 0)
     my_end = Int64ToString(end);
 
   headers->append(StringPrintf("Range: bytes=%s-%s\r\n", my_start.c_str(),
                                my_end.c_str()));
 }
 
 }  // namespace net