Whitelist all of content for "gn check"

.gn

Index: .gn
diff --git a/.gn b/.gn
index 658f215541c09b0360f710eeb199373f4d7b9677..0c5a7faba7c53a15a30f11b065e8d9346f47e0d7 100644
--- a/.gn
+++ b/.gn
@@ -36,28 +36,7 @@ check_targets = [
   "//chrome_elf/*",
   "//cloud_print/*",
   "//components/*",
-
-  #"//content/*",  # Enable when the individual ones below are done.
-  #"//content/app/*",
-  "//content/browser/*",
-  "//content/child/*",
-  "//content/common/*",
-  "//content/gpu/*",
-  "//content/ppapi_plugin/*",
-  "//content/public/*",
-  "//content/renderer/*",
-  "//content/shell/*",
-  "//content/test/*",
-
-  #"//content/utility/*",
-  #"//content/zygote/*",
-
-  "//content/test:content_perftests",
-  "//content/test:content_site_isolation_browsertests",
-  "//content/test:content_test_mojo_bindings",
-  "//content/test:content_unittests",
-  "//content/test:test_support",
-  "//content/utility/*",
+  "//content/*",
   "//courgette/*",
   "//crypto/*",
   "//data/*",