json_schema_compiler: Use std::vector<char> for binary values.

chrome/browser/extensions/api/copresence/copresence_translations.cc

Index: chrome/browser/extensions/api/copresence/copresence_translations.cc
diff --git a/chrome/browser/extensions/api/copresence/copresence_translations.cc b/chrome/browser/extensions/api/copresence/copresence_translations.cc
index 77a0d9f3a68e4affc10e0df5544f8d97fb11ebfc..492e6c2b5b32d9f9540346556cd0561062fb2929 100644
--- a/chrome/browser/extensions/api/copresence/copresence_translations.cc
+++ b/chrome/browser/extensions/api/copresence/copresence_translations.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/extensions/api/copresence/copresence_translations.h"
 
+#include "base/stl_util.h"
 #include "chrome/common/extensions/api/copresence.h"
 #include "components/copresence/proto/data.pb.h"
 #include "components/copresence/proto/enums.pb.h"
@@ -89,7 +90,9 @@ bool AddPublishToRequest(const std::string& app_id,
   publish_proto->set_id(publish.id);
   publish_proto->mutable_message()->mutable_type()->set_type(
       publish.message.type);
-  publish_proto->mutable_message()->set_payload(publish.message.payload);
+  publish_proto->mutable_message()->set_payload(
+      vector_as_array(&publish.message.payload),
+      publish.message.payload.size());
 
   int ttl = SanitizeTtl(publish.time_to_live_millis.get());
   if (ttl < 0)
@@ -101,7 +104,8 @@ bool AddPublishToRequest(const std::string& app_id,
                            publish_proto->mutable_token_exchange_strategy());
 
   DVLOG(2) << "Publishing message of type " << publish.message.type << ":\n"
-           << publish.message.payload;
+           << std::string(publish.message.payload.begin(),
+                          publish.message.payload.end());
   // TODO(ckehoe): Validate that required fields are non-empty, etc.
   return true;
 }