Add a SetDoNotFragment() method to DatagramSocket, and call this for

net/socket/client_socket_pool_base_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/socket/client_socket_pool_base.h"
 
 #include <stdint.h>
 #include <utility>
 #include <vector>
 
@@ skipping 136 matching lines @@
   }
 
   int Write(IOBuffer* /* buf */,
             int len,
             const CompletionCallback& /* callback */) override {
     was_used_to_convey_data_ = true;
     return len;
   }
   int SetReceiveBufferSize(int32_t size) override { return OK; }
   int SetSendBufferSize(int32_t size) override { return OK; }
+  int SetDoNotFragment(bool do_not_fragment) override { return OK; }
 
   // StreamSocket implementation.
   int Connect(const CompletionCallback& callback) override {
     connected_ = true;
     return OK;
   }
 
   void Disconnect() override { connected_ = false; }
   bool IsConnected() const override { return connected_; }
   bool IsConnectedAndIdle() const override {
@@ skipping 3599 matching lines @@
   request(1)->handle()->Reset();
   ASSERT_EQ(1, pool_->NumConnectJobsInGroup("a"));
 
   EXPECT_THAT(request(2)->WaitForResult(), IsOk());
   EXPECT_FALSE(request(1)->have_result());
 }
 
 }  // namespace
 
 }  // namespace net