Update NetLog to be thread safe.

net/socket/tcp_client_socket_unittest.cc

Index: net/socket/tcp_client_socket_unittest.cc
===================================================================
--- net/socket/tcp_client_socket_unittest.cc	(revision 66783)
+++ net/socket/tcp_client_socket_unittest.cc	(working copy)
@@ -105,10 +105,13 @@
   EXPECT_FALSE(sock_->IsConnected());
 
   int rv = sock_->Connect(&callback);
+
+  net::CapturingNetLog::EntryList net_log_entries;
+  net_log_.GetEntries(&net_log_entries);
   EXPECT_TRUE(net::LogContainsBeginEvent(
-      net_log_.entries(), 0, net::NetLog::TYPE_SOCKET_ALIVE));
+      net_log_entries, 0, net::NetLog::TYPE_SOCKET_ALIVE));
   EXPECT_TRUE(net::LogContainsBeginEvent(
-      net_log_.entries(), 1, net::NetLog::TYPE_TCP_CONNECT));
+      net_log_entries, 1, net::NetLog::TYPE_TCP_CONNECT));
   if (rv != OK) {
     ASSERT_EQ(rv, ERR_IO_PENDING);
     rv = callback.WaitForResult();
@@ -116,8 +119,9 @@
   }
 
   EXPECT_TRUE(sock_->IsConnected());
+  net_log_.GetEntries(&net_log_entries);
   EXPECT_TRUE(net::LogContainsEndEvent(
-      net_log_.entries(), -1, net::NetLog::TYPE_TCP_CONNECT));
+      net_log_entries, -1, net::NetLog::TYPE_TCP_CONNECT));
 
   sock_->Disconnect();
   EXPECT_FALSE(sock_->IsConnected());