POSIX only: Move client socket functionality from TCPClientSocket into TCPSocket.

net/socket/tcp_socket_unittest.cc

Index: net/socket/tcp_socket_unittest.cc
diff --git a/net/socket/tcp_socket_unittest.cc b/net/socket/tcp_socket_unittest.cc
index cd754ef79d13c145d21daef3fc927f3c28c5e054..7cb2518d43c751b9ec04726bb0fd9252ac44651c 100644
--- a/net/socket/tcp_socket_unittest.cc
+++ b/net/socket/tcp_socket_unittest.cc
@@ -11,7 +11,6 @@
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
-#include "build/build_config.h"
 #include "net/base/address_list.h"
 #include "net/base/io_buffer.h"
 #include "net/base/ip_endpoint.h"
@@ -200,10 +199,6 @@ TEST_F(TCPSocketTest, AcceptIPv6) {
   EXPECT_EQ(OK, connect_callback.WaitForResult());
 }
 
-// TODO(yzshen): Enable it for other platforms once TCPSocketLibevent supports
-// client socket operations.
-#if defined(OS_WIN)
-
 TEST_F(TCPSocketTest, ReadWrite) {
   ASSERT_NO_FATAL_FAILURE(SetUpListenIPv4());
 
@@ -264,7 +259,5 @@ TEST_F(TCPSocketTest, ReadWrite) {
   ASSERT_EQ(message, received_message);
 }
 
-#endif
-
 }  // namespace
 }  // namespace net