Lazily allocate input buffer for AsyncTCPSocket.

webrtc/base/asynctcpsocket.h

Index: webrtc/base/asynctcpsocket.h
diff --git a/webrtc/base/asynctcpsocket.h b/webrtc/base/asynctcpsocket.h
index 9ee37b272820ee865bf3c12cad625985b7477fdc..ea314931d65b12428c48ba9a5387787d014afbcf 100644
--- a/webrtc/base/asynctcpsocket.h
+++ b/webrtc/base/asynctcpsocket.h
@@ -72,9 +72,9 @@ class AsyncTCPSocketBase : public AsyncPacketSocket {
 
   scoped_ptr<AsyncSocket> socket_;
   bool listen_;
-  scoped_ptr<char[]> inbuf_;
+  Buffer inbuf_;
   Buffer outbuf_;
-  size_t insize_, inpos_;
+  size_t max_insize_;
   size_t max_outsize_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(AsyncTCPSocketBase);