Migrate HidServiceLinux and HidConnectionLinux to BrowserThread::UI.

extensions/browser/api/hid/hid_device_manager.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_device_manager.h"
 
 #include <limits>
 #include <vector>
 
 #include "base/lazy_instance.h"
@@ skipping 130 matching lines @@
     if (u2f_filter.Matches(device_info)) {
       return true;
     }
   }
 
   return false;
 }
 
 // static
 bool HidDeviceManager::IsCalledOnValidThread() {
-#if defined(OS_MACOSX)
-  // Migration from FILE thread to UI thread. OS X gets it first.
+#if defined(OS_WIN)
+  // TODO(reillyg): Migrate Windows backend from FILE thread to UI thread.
+  return content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE);
+#else
   return content::BrowserThread::CurrentlyOn(content::BrowserThread::UI);
-#else
-  // TODO(reillyg): Migrate Linux/CrOS and Windows as well.
-  return content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE);
 #endif
 }
 
 void HidDeviceManager::UpdateDevices() {
   DCHECK(IsCalledOnValidThread());
   HidService* hid_service = device::DeviceClient::Get()->GetHidService();
   DCHECK(hid_service);
 
   std::vector<device::HidDeviceInfo> devices;
   hid_service->GetDevices(&devices);
@@ skipping 16 matching lines @@
       new_id = next_resource_id_++;
     }
     new_resource_ids[device_info.device_id] = new_id;
     new_device_ids[new_id] = device_info.device_id;
   }
   device_ids_.swap(new_device_ids);
   resource_ids_.swap(new_resource_ids);
 }
 
 }  // namespace extensions