Implement the content/renderer and content/browser part of the Device Motion API.

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index 2c7c4a6f805c24eb854ae8a3550e93e8920ec7ad..bb86b5c60c33ee9f671eebabde84c55ea5cd500f 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -19,6 +19,7 @@
 #include "base/threading/thread_restrictions.h"
 #include "base/timer/hi_res_timer_manager.h"
 #include "content/browser/browser_thread_impl.h"
+#include "content/browser/device_orientation/device_motion_service.h"
 #include "content/browser/download/save_file_manager.h"
 #include "content/browser/gamepad/gamepad_service.h"
 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
@@ -774,6 +775,7 @@ void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
   // Must happen after the I/O thread is shutdown since this class lives on the
   // I/O thread and isn't threadsafe.
   GamepadService::GetInstance()->Terminate();
+  DeviceMotionService::GetInstance()->Shutdown();
 
   URLDataManager::DeleteDataSources();
 #endif  // !defined(OS_IOS)