net: have SockaddrStorage type in its own header file

This patch moves SockaddrStorage type into its own header file,
as it seems more appropriate than in the generic net_util.h. This
should help breakout net_util.h even further. We are almost there.

BUG=488531
TEST=net_unittests
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[email protected]

Review URL: https://codereview.chromium.org/1584503002

Cr-Commit-Position: refs/heads/master@{#369081}
diff --git a/net/socket/tcp_socket_unittest.cc b/net/socket/tcp_socket_unittest.cc
index d9d13c5..ade3ee7fd 100644
--- a/net/socket/tcp_socket_unittest.cc
+++ b/net/socket/tcp_socket_unittest.cc
@@ -15,7 +15,7 @@
 #include "net/base/io_buffer.h"
 #include "net/base/ip_endpoint.h"
 #include "net/base/net_errors.h"
-#include "net/base/net_util.h"
+#include "net/base/sockaddr_storage.h"
 #include "net/base/test_completion_callback.h"
 #include "net/socket/tcp_client_socket.h"
 #include "testing/gtest/include/gtest/gtest.h"