Decompose //extensions/browser/BUILD.gn

extensions/browser/api/usb/usb_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/usb/usb_api.h"
 
 #include <algorithm>
 #include <memory>
 #include <numeric>
 #include <string>
@@ skipping 507 matching lines @@
 
   service->GetDevices(
       base::Bind(&UsbFindDevicesFunction::OnGetDevicesComplete, this));
   return RespondLater();
 }
 
 void UsbFindDevicesFunction::OnGetDevicesComplete(
     const std::vector<scoped_refptr<UsbDevice>>& devices) {
   result_.reset(new base::ListValue());
   barrier_ = base::BarrierClosure(
-      devices.size(), base::Bind(&UsbFindDevicesFunction::OpenComplete, this));
+      static_cast<int>(devices.size()),
+      base::Bind(&UsbFindDevicesFunction::OpenComplete, this));
 
   for (const scoped_refptr<UsbDevice>& device : devices) {
     if (device->vendor_id() != vendor_id_ ||
         device->product_id() != product_id_) {
       barrier_.Run();
     } else {
       device->Open(base::Bind(&UsbFindDevicesFunction::OnDeviceOpened, this));
     }
   }
 }
@@ skipping 732 matching lines @@
 
     std::unique_ptr<base::ListValue> error_args(new base::ListValue());
     error_args->AppendBoolean(false);
     // Using ErrorWithArguments is discouraged but required to maintain
     // compatibility with existing applications.
     Respond(ErrorWithArguments(std::move(error_args), kErrorResetDevice));
   }
 }
 
 }  // namespace extensions