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

mojo/public/platform/native/BUILD.gn

Index: mojo/public/platform/native/BUILD.gn
diff --git a/mojo/public/platform/native/BUILD.gn b/mojo/public/platform/native/BUILD.gn
index e7919aed815bb30564b774959eb13632d7498a36..a2f050c56daef7d9f9e20ec966bac590cd910ede 100644
--- a/mojo/public/platform/native/BUILD.gn
+++ b/mojo/public/platform/native/BUILD.gn
@@ -25,9 +25,8 @@ source_set("system_thunks") {
   # source_set here, this flag change is not needed.
 }
 
-# GYP version: mojo/mojo_public_gles2_for_loadable_module.gypi
 source_set("gles2_thunks") {
-  visibility = [ "//mojo/public/gles2:for_shared_library" ]
+  visibility = [ "//mojo/public/c/gles2" ]
 
   sources = [
     "gles2_thunks.cc",
@@ -47,7 +46,7 @@ source_set("gles2_thunks") {
   configs += [ "//third_party/khronos:khronos_headers" ]
 
   deps = [
-    "//mojo/public/c/gles2",
+    "//mojo/public/c/gles2:headers",
     "//mojo/public/c/environment",
     "//mojo/public/c/system",
   ]