Fix crash in Android DevTools port forwarding handler.

content/browser/devtools/protocol/tethering_handler.cc

Index: content/browser/devtools/protocol/tethering_handler.cc
diff --git a/content/browser/devtools/protocol/tethering_handler.cc b/content/browser/devtools/protocol/tethering_handler.cc
index 3f9b8ad60c28796381049c1002d9f21b209e4af1..2f3f4a132c03caaee7e3db7b9bef9a9044adb3a8 100644
--- a/content/browser/devtools/protocol/tethering_handler.cc
+++ b/content/browser/devtools/protocol/tethering_handler.cc
@@ -40,8 +40,10 @@ class SocketPump {
   std::string Init(const CreateServerSocketCallback& socket_callback) {
     std::string channel_name;
     server_socket_ = socket_callback.Run(&channel_name);
-    if (!server_socket_.get() || channel_name.empty())
+    if (!server_socket_.get() || channel_name.empty()) {
       SelfDestruct();
+      return std::string();
+    }
 
     int result = server_socket_->Accept(
         &accepted_socket_,