[WPT/common/security-features] Do not generate debug-only files

this CL suppresses generation of debug-only files
in release target, to avoid unintended addition of such files
into git repositories.

Bug: 906850
Change-Id: I55dac746fb7f2690f50d8a40a8c97af51615db03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2107337Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751232}

third_party/blink/web_tests/external/wpt/common/security-features/tools/generate.py

@@ -258,13 +258,14 @@ def generate_test_source_files(spec_directory, test_helper_filenames,
     test_expansion_schema = spec_json['test_expansion_schema']
     specification = spec_json['specification']
 
+    if target == "debug":
         spec_json_js_template = util.get_template('spec_json.js.template')
         util.write_file(
             os.path.join(spec_directory, "generic", "spec_json.js"),
             spec_json_js_template % {'spec_json': json.dumps(spec_json)})
-
         util.write_file(
-        os.path.join(spec_directory, "generic", "debug-output.spec.src.json"),
+            os.path.join(spec_directory, "generic",
+                         "debug-output.spec.src.json"),
             json.dumps(spec_json, indent=2, separators=(',', ': ')))
 
     # Choose a debug/release template depending on the target.