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

net/spdy/spdy_io_buffer.cc

Index: net/spdy/spdy_io_buffer.cc
diff --git a/net/spdy/spdy_io_buffer.cc b/net/spdy/spdy_io_buffer.cc
index f7120c8125ece3f7737d77c235f38890d8cb6a51..0ad6927954d985a9af676c3997b33622879d2f6e 100644
--- a/net/spdy/spdy_io_buffer.cc
+++ b/net/spdy/spdy_io_buffer.cc
@@ -11,13 +11,14 @@ namespace net {
 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() {}