Remove BrowserThread dependency from usb_service.

components/usb_service/usb_device_impl.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 "components/usb_service/usb_device_impl.h"
 
 #include <algorithm>
 
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
+#include "base/thread_task_runner_handle.h"
 #include "components/usb_service/usb_context.h"
 #include "components/usb_service/usb_device_handle_impl.h"
 #include "components/usb_service/usb_error.h"
 #include "components/usb_service/usb_interface_impl.h"
-#include "content/public/browser/browser_thread.h"
 #include "third_party/libusb/src/libusb/libusb.h"
 
 #if defined(OS_CHROMEOS)
 #include "base/sys_info.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/permission_broker_client.h"
 #endif  // defined(OS_CHROMEOS)
 
-using content::BrowserThread;
-
 namespace {
 
 #if defined(OS_CHROMEOS)
 void OnRequestUsbAccessReplied(
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
     const base::Callback<void(bool success)>& callback,
     bool success) {
-  BrowserThread::PostTask(
-      BrowserThread::FILE, FROM_HERE, base::Bind(callback, success));
+  task_runner->PostTask(FROM_HERE, base::Bind(callback, success));
 }
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace
 
 namespace usb_service {
 
-UsbDeviceImpl::UsbDeviceImpl(scoped_refptr<UsbContext> context,
-                             PlatformUsbDevice platform_device,
-                             uint16 vendor_id,
-                             uint16 product_id,
-                             uint32 unique_id)
+UsbDeviceImpl::UsbDeviceImpl(
+    scoped_refptr<UsbContext> context,
+    scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
+    PlatformUsbDevice platform_device,
+    uint16 vendor_id,
+    uint16 product_id,
+    uint32 unique_id)
     : UsbDevice(vendor_id, product_id, unique_id),
       platform_device_(platform_device),
-      context_(context) {
+      context_(context),
+      ui_task_runner_(ui_task_runner) {
   CHECK(platform_device) << "platform_device cannot be NULL";
   libusb_ref_device(platform_device);
 }
 
 UsbDeviceImpl::~UsbDeviceImpl() {
   DCHECK(thread_checker_.CalledOnValidThread());
   for (HandlesVector::iterator it = handles_.begin(); it != handles_.end();
        ++it) {
     (*it)->InternalClose();
   }
@@ skipping 12 matching lines @@
   // use permission broker.
   if (base::SysInfo::IsRunningOnChromeOS()) {
     chromeos::PermissionBrokerClient* client =
         chromeos::DBusThreadManager::Get()->GetPermissionBrokerClient();
     DCHECK(client) << "Could not get permission broker client.";
     if (!client) {
       callback.Run(false);
       return;
     }
 
-    BrowserThread::PostTask(
-        BrowserThread::UI,
+    ui_task_runner_->PostTask(
         FROM_HERE,
         base::Bind(&chromeos::PermissionBrokerClient::RequestUsbAccess,
                    base::Unretained(client),
                    vendor_id(),
                    product_id(),
                    interface_id,
-                   base::Bind(&OnRequestUsbAccessReplied, callback)));
+                   base::Bind(&OnRequestUsbAccessReplied,
+                              base::ThreadTaskRunnerHandle::Get(),
+                              callback)));
   }
 }
 
 #endif
 
 scoped_refptr<UsbDeviceHandle> UsbDeviceImpl::Open() {
   DCHECK(thread_checker_.CalledOnValidThread());
   PlatformUsbDeviceHandle handle;
   const int rv = libusb_open(platform_device_, &handle);
   if (LIBUSB_SUCCESS == rv) {
@@ skipping 40 matching lines @@
 
 void UsbDeviceImpl::OnDisconnect() {
   DCHECK(thread_checker_.CalledOnValidThread());
   HandlesVector handles;
   swap(handles, handles_);
   for (HandlesVector::iterator it = handles.begin(); it != handles.end(); ++it)
     (*it)->InternalClose();
 }
 
 }  // namespace usb_service