Update some documentation for gles2_conform_support.

gpu/gles2_conform_support/BUILD.gn

Index: gpu/gles2_conform_support/BUILD.gn
diff --git a/gpu/gles2_conform_support/BUILD.gn b/gpu/gles2_conform_support/BUILD.gn
index 65dcb03b1c30c43d9f42634f8428345dddf1aeab..2cb2bb50939b17d1579715383f74ab426fd9fd7a 100644
--- a/gpu/gles2_conform_support/BUILD.gn
+++ b/gpu/gles2_conform_support/BUILD.gn
@@ -196,8 +196,5 @@ test("gles2_conform_test") {
     deps += [ ":generate_gles2_conform_tests" ]
     sources += [ "$target_gen_dir/gles2_conform_test_autogen.cc" ]
     data += [ "//third_party/gles2_conform/GTF_ES/" ]
-
-    # TODO: Make these tests pull in the correct data dependencies once they
-    # are exported in GN. Maybe from  //third_party/gles2_conform/GTF_ES/
   }
 }