Address some TODO(GYP)s in the GN build.

chrome/BUILD.gn

Index: chrome/BUILD.gn
diff --git a/chrome/BUILD.gn b/chrome/BUILD.gn
index 65dc4d59aa6dabfa8f7c89e7d13f361758e78ca7..c65eb9930b713821629aa5c45a6c6d62c63b5f7e 100644
--- a/chrome/BUILD.gn
+++ b/chrome/BUILD.gn
@@ -119,8 +119,6 @@ if (!is_android && !is_mac) {
         ":chrome_dll",
         ":chrome_exe_version",
         ":file_pre_reader",
-
-        # 'chrome_nacl_win64" TODO(GYP) bug 512869
         "//base",
         "//breakpad:breakpad_handler",
         "//breakpad:breakpad_sender",
@@ -1354,7 +1352,7 @@ if (is_linux) {
 
       args = [
         "./" + rebase_path(dump_syms_binary, root_build_dir),
-        "0",  # TODO(GYP) This is linux_strip_binary if it is needed.
+        "0",  # strip_binary = false
         rebase_path(chrome_binary, root_build_dir),
         rebase_path(symbol_file, root_build_dir),
       ]