Stop linking in the old Mojo EDK.

mojo/runner/child/BUILD.gn

Index: mojo/runner/child/BUILD.gn
diff --git a/mojo/runner/child/BUILD.gn b/mojo/runner/child/BUILD.gn
index 91e09f56e7805be0b9d00baa2b07f1be4866e5f4..e344fceb9860027d8996ab27030bd0349657097d 100644
--- a/mojo/runner/child/BUILD.gn
+++ b/mojo/runner/child/BUILD.gn
@@ -22,10 +22,10 @@ source_set("lib") {
   deps = [
     ":interfaces",
     "//base",
+    "//mojo/edk/system",
     "//mojo/message_pump",
     "//mojo/platform_handle:platform_handle_impl",
     "//mojo/shell/public/interfaces",
-    "//third_party/mojo/src/mojo/edk/system",
   ]
 }
 
@@ -53,11 +53,11 @@ source_set("test_native_main") {
 
   deps = [
     "//base",
+    "//mojo/edk/system",
     "//mojo/gles2",
     "//mojo/message_pump",
     "//mojo/runner/child:lib",
     "//mojo/shell/public/cpp",
-    "//third_party/mojo/src/mojo/edk/system",
   ]
 }