Fixing absolute path that was breaking chromium

webrtc/test/BUILD.gn

Index: webrtc/test/BUILD.gn
diff --git a/webrtc/test/BUILD.gn b/webrtc/test/BUILD.gn
index 252e638a76f4af4ac92fa2e875d47aa279f921e8..bf8e59dc6cf9c297e12dc8370156725e8cb52414 100644
--- a/webrtc/test/BUILD.gn
+++ b/webrtc/test/BUILD.gn
@@ -317,7 +317,7 @@ rtc_source_set("fileutils") {
   if (is_ios) {
     sources += [ "testsupport/iosfileutils.mm" ]
     deps = [
-      "//webrtc/sdk:objc_common",
+      "../sdk:objc_common",
     ]
   }
   visibility = [ ":*" ]