Deprecate Shift+Alt to switch IME and use Ctrl+Shift+Space instead.

ash/accelerators/accelerator_controller.h

Index: ash/accelerators/accelerator_controller.h
diff --git a/ash/accelerators/accelerator_controller.h b/ash/accelerators/accelerator_controller.h
index 29c4760ce3168b5698f7dc86af4bb7d7ab1d2ea5..79cc67399a608731c0d2fb866aa304d3d1d4257b 100644
--- a/ash/accelerators/accelerator_controller.h
+++ b/ash/accelerators/accelerator_controller.h
@@ -133,6 +133,8 @@ class ASH_EXPORT AcceleratorController : public ui::AcceleratorTarget {
   FRIEND_TEST_ALL_PREFIXES(AcceleratorControllerTest, GlobalAccelerators);
   FRIEND_TEST_ALL_PREFIXES(AcceleratorControllerTest,
                            DontRepeatToggleFullscreen);
+  FRIEND_TEST_ALL_PREFIXES(DeprecatedAcceleratorTester,
+                           TestDeprecatedAcceleratorsBehavior);
 
   // Initializes the accelerators this class handles as a target.
   void Init();