Without this patch:
```
$ npm run check-json
> chrome-devtools-frontend@ check-json ~/projects/devtools/devtools-frontend
> node scripts/json_validator/validate_module_json.js
schema id ignored http://json-schema.org/draft-04/schema#
schema id ignored http://json-schema.org/draft-04/schema#
~/projects/devtools/devtools-frontend/node_modules/ajv/lib/ajv.js:92
if (!v) throw new Error('no schema with key or ref "' + schemaKeyRef + '"');
^
Error: no schema with key or ref "http://json-schema.org/draft-04/schema#"
at Ajv.validate (~/projects/devtools/devtools-frontend/node_modules/ajv/lib/ajv.js:92:19)
at Ajv.validateSchema (~/projects/devtools/devtools-frontend/node_modules/ajv/lib/ajv.js:173:20)
at Ajv._addSchema (~/projects/devtools/devtools-frontend/node_modules/ajv/lib/ajv.js:306:10)
at Ajv.addSchema (~/projects/devtools/devtools-frontend/node_modules/ajv/lib/ajv.js:136:29)
at Ajv.addMetaSchema (~/projects/devtools/devtools-frontend/node_modules/ajv/lib/ajv.js:151:8)
at Object.<anonymous> (~/projects/devtools/devtools-frontend/scripts/json_validator/validate_module_json.js:20:5)
at Module._compile (internal/modules/cjs/loader.js:776:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:787:10)
at Module.load (internal/modules/cjs/loader.js:643:32)
at Function.Module._load (internal/modules/cjs/loader.js:556:12)
```
After applying this patch:
```
$ npm run check-json
> chrome-devtools-frontend@ check-json ~/projects/devtools/devtools-frontend
> node scripts/json_validator/validate_module_json.js
schema $id ignored http://json-schema.org/draft-07/schema#
schema $id ignored http://json-schema.org/draft-07/schema#
schema $id ignored http://json-schema.org/draft-07/schema#
```
Fixed: chromium:1030215
Change-Id: Ie799ffbc9dfe50bdfedb18a0d9ac2ce63a9e4439
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/1953774
Auto-Submit: Mathias Bynens <mathias@chromium.org>
Commit-Queue: Mathias Bynens <mathias@chromium.org>
Reviewed-by: Tim van der Lippe <tvanderlippe@chromium.org>