Simplify the thunk targets since we don't support apps as components

examples/sample_app/BUILD.gn

Index: examples/sample_app/BUILD.gn
diff --git a/examples/sample_app/BUILD.gn b/examples/sample_app/BUILD.gn
index 597a71bd1f03c2f10abbab49a67d4c77b1050902..34bc5c319e521b4b70ec6de4494e2513737aa8b1 100644
--- a/examples/sample_app/BUILD.gn
+++ b/examples/sample_app/BUILD.gn
@@ -15,13 +15,12 @@ mojo_native_application("sample_app") {
     ":spinning_cube",
     "//base",
     "//gpu/command_buffer/client:gles2_interface",
-    "//mojo/public/c/system:for_shared_library",
+    "//mojo/public/c/gles2",
     "//mojo/public/cpp/application:standalone",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/environment",
     "//mojo/public/cpp/system",
     "//mojo/public/cpp/utility",
-    "//mojo/public/gles2:for_shared_library",
     "//mojo/services/public/interfaces/geometry",
     "//mojo/services/public/interfaces/native_viewport",
   ]
@@ -35,6 +34,6 @@ source_set("spinning_cube") {
 
   deps = [
     "//base",
-    "//mojo/public/gles2:for_shared_library",
+    "//mojo/public/c/gles2",
   ]
 }