Make TCPClientSocket* inherit from NonThreadSafe.

net/socket/tcp_client_socket_libevent.cc

Index: net/socket/tcp_client_socket_libevent.cc
diff --git a/net/socket/tcp_client_socket_libevent.cc b/net/socket/tcp_client_socket_libevent.cc
index d819ad7d7604d221099f90ebf2bb0c9965a6c846..1367dec9f13d227f9aeb973baa087d5aaa0248b5 100644
--- a/net/socket/tcp_client_socket_libevent.cc
+++ b/net/socket/tcp_client_socket_libevent.cc
@@ -144,6 +144,8 @@ TCPClientSocketLibevent::~TCPClientSocketLibevent() {
 }
 
 int TCPClientSocketLibevent::Connect(CompletionCallback* callback) {
+  DCHECK(CalledOnValidThread());
+
   // If already connected, then just return OK.
   if (socket_ != kInvalidSocket)
     return OK;
@@ -218,6 +220,8 @@ int TCPClientSocketLibevent::DoConnect() {
 }
 
 void TCPClientSocketLibevent::Disconnect() {
+  DCHECK(CalledOnValidThread());
+
   if (socket_ == kInvalidSocket)
     return;
 
@@ -236,6 +240,8 @@ void TCPClientSocketLibevent::Disconnect() {
 }
 
 bool TCPClientSocketLibevent::IsConnected() const {
+  DCHECK(CalledOnValidThread());
+
   if (socket_ == kInvalidSocket || waiting_connect_)
     return false;
 
@@ -251,6 +257,8 @@ bool TCPClientSocketLibevent::IsConnected() const {
 }
 
 bool TCPClientSocketLibevent::IsConnectedAndIdle() const {
+  DCHECK(CalledOnValidThread());
+
   if (socket_ == kInvalidSocket || waiting_connect_)
     return false;
 
@@ -269,6 +277,7 @@ bool TCPClientSocketLibevent::IsConnectedAndIdle() const {
 int TCPClientSocketLibevent::Read(IOBuffer* buf,
                                   int buf_len,
                                   CompletionCallback* callback) {
+  DCHECK(CalledOnValidThread());
   DCHECK_NE(kInvalidSocket, socket_);
   DCHECK(!waiting_connect_);
   DCHECK(!read_callback_);
@@ -305,6 +314,7 @@ int TCPClientSocketLibevent::Read(IOBuffer* buf,
 int TCPClientSocketLibevent::Write(IOBuffer* buf,
                                    int buf_len,
                                    CompletionCallback* callback) {
+  DCHECK(CalledOnValidThread());
   DCHECK_NE(kInvalidSocket, socket_);
   DCHECK(!waiting_connect_);
   DCHECK(!write_callback_);
@@ -338,6 +348,7 @@ int TCPClientSocketLibevent::Write(IOBuffer* buf,
 }
 
 bool TCPClientSocketLibevent::SetReceiveBufferSize(int32 size) {
+  DCHECK(CalledOnValidThread());
   int rv = setsockopt(socket_, SOL_SOCKET, SO_RCVBUF,
       reinterpret_cast<const char*>(&size),
       sizeof(size));
@@ -346,6 +357,7 @@ bool TCPClientSocketLibevent::SetReceiveBufferSize(int32 size) {
 }
 
 bool TCPClientSocketLibevent::SetSendBufferSize(int32 size) {
+  DCHECK(CalledOnValidThread());
   int rv = setsockopt(socket_, SOL_SOCKET, SO_SNDBUF,
       reinterpret_cast<const char*>(&size),
       sizeof(size));
@@ -477,6 +489,7 @@ void TCPClientSocketLibevent::DidCompleteWrite() {
 }
 
 int TCPClientSocketLibevent::GetPeerAddress(AddressList* address) const {
+  DCHECK(CalledOnValidThread());
   DCHECK(address);
   if (!current_ai_)
     return ERR_UNEXPECTED;