Repro attempt for GN build failure on Mac.

storage/browser/BUILD.gn

Index: storage/browser/BUILD.gn
diff --git a/storage/browser/BUILD.gn b/storage/browser/BUILD.gn
index e1880c7d29b13813814cea57f5de815f5001162e..e98bdc7ceab340c611712f4ed8c3d142ab74cfd2 100644
--- a/storage/browser/BUILD.gn
+++ b/storage/browser/BUILD.gn
@@ -222,6 +222,18 @@ executable("dump_file_system") {
   ]
 }
 
+source_set("gn_repro_sources") {
+  sources = [
+    "gn_repro.cc",
+  ]
+}
+
+static_library("gn_repro") {
+  deps = [
+    ":gn_repro_sources",
+  ]
+}
+
 test("storage_unittests") {
   sources = [
     # This target is in the process of being populated. See
@@ -252,6 +264,7 @@ test("storage_unittests") {
 
   deps = [
     ":browser",
+    ":gn_repro",
     "//base/test:run_all_unittests",
     "//base/test:test_support",
     "//net:test_support",