Add more size_t -> int warning fixes for the win x64 GN build.

R=brettw@chromium.org
BUG=354261

Review URL: https://codereview.chromium.org/941863002

Cr-Original-Commit-Position: refs/heads/master@{#317439}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 8ec93a3ac28c857ae106a2c1929cc935ab76ec03

json_schema_api.gni

@@ -183,6 +183,7 @@ template("json_schema_api") {
       sources += get_target_outputs(":$schema_generator_name")
       public_deps += [ ":$schema_generator_name" ]
       deps += [ "//tools/json_schema_compiler:generated_api_util" ]
+      configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
     }
 
     if (bundle) {