Remove content::BrowserThread knowledge from Device Sensors

content/browser/device_sensors/sensor_manager_android.h

Index: content/browser/device_sensors/sensor_manager_android.h
diff --git a/content/browser/device_sensors/sensor_manager_android.h b/content/browser/device_sensors/sensor_manager_android.h
index 6a3e45da1c317295c8b97ac5241e77fe270eeac2..d4605ac2b877e0fc8d1f5dd64a80afb3723ee7e1 100644
--- a/content/browser/device_sensors/sensor_manager_android.h
+++ b/content/browser/device_sensors/sensor_manager_android.h
@@ -9,6 +9,8 @@
 
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/sequenced_task_runner.h"
 #include "base/synchronization/lock.h"
 #include "content/browser/device_sensors/device_sensors_consts.h"
 #include "content/common/content_export.h"
@@ -82,7 +84,8 @@ class CONTENT_EXPORT SensorManagerAndroid {
       DeviceOrientationHardwareBuffer* buffer);
   void StopFetchingDeviceOrientationAbsoluteData();
 
-  void Shutdown();
+  void SetUITaskRunner(scoped_refptr<base::SequencedTaskRunner> ui_task_runner);
+  void ShutDownOnUIThread();
 
   // A Java counterpart will be generated for this enum.
   // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.content.browser
@@ -160,6 +163,8 @@ class CONTENT_EXPORT SensorManagerAndroid {
   base::Lock orientation_buffer_lock_;
   base::Lock orientation_absolute_buffer_lock_;
 
+  scoped_refptr<base::SequencedTaskRunner> ui_task_runner_;
+
   bool is_shutdown_;
 
   DISALLOW_COPY_AND_ASSIGN(SensorManagerAndroid);