Use std::vector<char> rather than std::string to represent a base::BinaryValue

extensions/browser/api/hid/hid_api.cc

Index: extensions/browser/api/hid/hid_api.cc
diff --git a/extensions/browser/api/hid/hid_api.cc b/extensions/browser/api/hid/hid_api.cc
index e021cf2a8cc1aaa88a13edd9b0a8592c69ba3f26..c7d6a83143d5f79a135c2ef59ea40f312a107299 100644
--- a/extensions/browser/api/hid/hid_api.cc
+++ b/extensions/browser/api/hid/hid_api.cc
@@ -253,8 +253,8 @@ void HidSendFunction::StartWork(HidConnection* connection) {
   scoped_refptr<net::IOBufferWithSize> buffer(
       new net::IOBufferWithSize(parameters_->data.size() + 1));
   buffer->data()[0] = static_cast<uint8_t>(parameters_->report_id);
-  memcpy(
-      buffer->data() + 1, parameters_->data.c_str(), parameters_->data.size());
+  memcpy(buffer->data() + 1, parameters_->data.data(),
+         parameters_->data.size());
   connection->Write(buffer, buffer->size(),
                     base::Bind(&HidSendFunction::OnFinished, this));
 }