Replace NOTREACHED() with NOTIMPLEMENTED() for TCP sockets in ChromiumPacketSocketFactory.

remoting/protocol/chromium_socket_factory.cc

Index: remoting/protocol/chromium_socket_factory.cc
diff --git a/remoting/protocol/chromium_socket_factory.cc b/remoting/protocol/chromium_socket_factory.cc
index 82a8eb437a58b12ca80a9032106d1a3f4e9ac13c..22b59b477584f7da1679c15519437a21c37dc25e 100644
--- a/remoting/protocol/chromium_socket_factory.cc
+++ b/remoting/protocol/chromium_socket_factory.cc
@@ -386,7 +386,8 @@ rtc::AsyncPacketSocket* ChromiumPacketSocketFactory::CreateServerTcpSocket(
     uint16_t min_port,
     uint16_t max_port,
     int opts) {
-  // We don't use TCP sockets for remoting connections.
+  // TCP sockets are not supported.
+  // TODO(sergeyu): Implement TCP support crbug.com/600032 .
   NOTIMPLEMENTED();
   return nullptr;
 }
@@ -398,8 +399,9 @@ ChromiumPacketSocketFactory::CreateClientTcpSocket(
       const rtc::ProxyInfo& proxy_info,
       const std::string& user_agent,
       int opts) {
-  // We don't use TCP sockets for remoting connections.
-  NOTREACHED();
+  // TCP sockets are not supported.
+  // TODO(sergeyu): Implement TCP support crbug.com/600032 .
+  NOTIMPLEMENTED();
   return nullptr;
 }