Remove content::BrowserThread knowledge from Device Sensors

content/browser/device_sensors/device_sensor_host.cc

Index: content/browser/device_sensors/device_sensor_host.cc
diff --git a/content/browser/device_sensors/device_sensor_host.cc b/content/browser/device_sensors/device_sensor_host.cc
index e4b806967e5c16aac8448233141f422249d19874..fd94e0cc60203adb19d1519d99758fca868c09d4 100644
--- a/content/browser/device_sensors/device_sensor_host.cc
+++ b/content/browser/device_sensors/device_sensor_host.cc
@@ -4,8 +4,8 @@
 
 #include "content/browser/device_sensors/device_sensor_host.h"
 
+#include "base/message_loop/message_loop.h"
 #include "content/browser/device_sensors/device_sensor_service.h"
-#include "content/public/browser/browser_thread.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 
 namespace content {
@@ -21,7 +21,8 @@ void DeviceSensorHost<MojoInterface, consumer_type>::Create(
 template <typename MojoInterface, ConsumerType consumer_type>
 DeviceSensorHost<MojoInterface, consumer_type>::DeviceSensorHost()
     : is_started_(false) {
-  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DCHECK(base::MessageLoopForIO::IsCurrent());
+  DeviceSensorService::GetInstance()->InitOnIOThread();
 }
 
 template <typename MojoInterface, ConsumerType consumer_type>