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

extensions/browser/api/hid/hid_api.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/browser/api/hid/hid_api.h"
 
 #include <string>
 #include <vector>
 
 #include "device/core/device_client.h"
@@ skipping 235 matching lines @@
   parameters_ = hid::Send::Params::Create(*args_);
   EXTENSION_FUNCTION_VALIDATE(parameters_.get());
   set_connection_id(parameters_->connection_id);
   return true;
 }
 
 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));
 }
 
 void HidSendFunction::OnFinished(bool success) {
   if (success) {
     Respond(NoArguments());
   } else {
     Respond(Error(kErrorTransfer));
   }
@@ skipping 52 matching lines @@
 
 void HidSendFeatureReportFunction::OnFinished(bool success) {
   if (success) {
     Respond(NoArguments());
   } else {
     Respond(Error(kErrorTransfer));
   }
 }
 
 }  // namespace extensions