Migrate HidServiceLinux and HidConnectionLinux to BrowserThread::UI.

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 46 matching lines @@
 }  // namespace
 
 namespace extensions {
 
 HidAsyncApiFunction::HidAsyncApiFunction()
     : device_manager_(NULL), connection_manager_(NULL) {}
 
 HidAsyncApiFunction::~HidAsyncApiFunction() {}
 
 bool HidAsyncApiFunction::PrePrepare() {
-#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.
+  set_work_thread_id(content::BrowserThread::FILE);
+#else
   set_work_thread_id(content::BrowserThread::UI);
-#else
-  // TODO(reillyg): Migrate Linux/CrOS and Windows as well.
-  set_work_thread_id(content::BrowserThread::FILE);
 #endif
   device_manager_ = HidDeviceManager::Get(browser_context());
   if (!device_manager_) {
     return false;
   }
   connection_manager_ =
       ApiResourceManager<HidConnectionResource>::Get(browser_context());
   if (!connection_manager_) {
     return false;
   }
@@ skipping 261 matching lines @@
 
 void HidSendFeatureReportFunction::OnFinished(bool success) {
   if (!success) {
     CompleteWithError(kErrorTransfer);
     return;
   }
   AsyncWorkCompleted();
 }
 
 }  // namespace extensions