Use relative paths for //net/dcsctp/public:socket.

Quick fix for Chromium fuzzer builds, for example
https://ci.chromium.org/ui/p/chromium/builders/try/win-libfuzzer-asan-rel/b8850210174432806976/overview.

Bug: None
Change-Id: Id43269f58ccc976a694fbf1cef2721f654f95e62
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/214962
Reviewed-by: Victor Boivie <boivie@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33682}
diff --git a/net/dcsctp/public/BUILD.gn b/net/dcsctp/public/BUILD.gn
index 8a7e26e..9bf3619 100644
--- a/net/dcsctp/public/BUILD.gn
+++ b/net/dcsctp/public/BUILD.gn
@@ -23,10 +23,10 @@
 
 rtc_source_set("socket") {
   deps = [
-    "//api:array_view",
-    "//rtc_base",
-    "//rtc_base:checks",
-    "//rtc_base:rtc_base_approved",
+    "../../../api:array_view",
+    "../../../rtc_base",
+    "../../../rtc_base:checks",
+    "../../../rtc_base:rtc_base_approved",
   ]
   sources = [
     "dcsctp_socket.h",