[net] Change order of RequestPriority to natural: higher > lower

net/spdy/spdy_io_buffer.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/spdy/spdy_io_buffer.h"
 #include "net/spdy/spdy_stream.h"
 
 namespace net {
 
 // static
 uint64 SpdyIOBuffer::order_ = 0;
 
 SpdyIOBuffer::SpdyIOBuffer(
-    IOBuffer* buffer, int size, int priority, SpdyStream* stream)
+    IOBuffer* buffer, int size, RequestPriority priority, SpdyStream* stream)
   : buffer_(new DrainableIOBuffer(buffer, size)),
     priority_(priority),
     position_(++order_),
     stream_(stream) {}
 
-SpdyIOBuffer::SpdyIOBuffer() : priority_(0), position_(0), stream_(NULL) {}
+SpdyIOBuffer::SpdyIOBuffer() : priority_(HIGHEST), position_(0), stream_(NULL) {
+}
 
 SpdyIOBuffer::~SpdyIOBuffer() {}
 
 void SpdyIOBuffer::release() {
   buffer_ = NULL;
   stream_ = NULL;
 }
 
 }  // namespace net