Remove content::BrowserThread knowledge from Device Sensors

content/browser/device_sensors/device_sensor_host.h

Index: content/browser/device_sensors/device_sensor_host.h
diff --git a/content/browser/device_sensors/device_sensor_host.h b/content/browser/device_sensors/device_sensor_host.h
index e7fceb3f255bea1e9327f9010c816f5d0d9259a0..37cf1f698cf42c5afe009d97bbe21e86f469ba93 100644
--- a/content/browser/device_sensors/device_sensor_host.h
+++ b/content/browser/device_sensors/device_sensor_host.h
@@ -7,6 +7,7 @@
 
 #include "base/macros.h"
 #include "base/memory/shared_memory.h"
+#include "base/sequenced_task_runner.h"
 #include "content/browser/device_sensors/device_sensors_consts.h"
 #include "device/sensors/public/interfaces/light.mojom.h"
 #include "device/sensors/public/interfaces/motion.mojom.h"
@@ -19,13 +20,15 @@ namespace content {
 template <typename MojoInterface, ConsumerType consumer_type>
 class DeviceSensorHost : public MojoInterface {
  public:
-  static void Create(mojo::InterfaceRequest<MojoInterface> request);
+  static void Create(scoped_refptr<base::SequencedTaskRunner> ui_task_runner,
+                     mojo::InterfaceRequest<MojoInterface> request);
 
   // All methods below to be called on the IO thread.
   ~DeviceSensorHost() override;
 
  private:
-  DeviceSensorHost();
+  explicit DeviceSensorHost(
+      scoped_refptr<base::SequencedTaskRunner> ui_task_runner);
 
   void StartPolling(
       const typename MojoInterface::StartPollingCallback& callback) override;
@@ -33,6 +36,7 @@ class DeviceSensorHost : public MojoInterface {
 
   bool is_started_;
 
+  scoped_refptr<base::SequencedTaskRunner> ui_task_runner_;
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceSensorHost);