Revert "Do not consume Shift+Alt in Ash to make Chromoting happy."

ash/accelerators/accelerator_controller.cc

Index: ash/accelerators/accelerator_controller.cc
diff --git a/ash/accelerators/accelerator_controller.cc b/ash/accelerators/accelerator_controller.cc
index 81ed6f787a844d3eea10159021aba71918bdff89..f8782ea178f98fcddb01f759836e450eef0cafdf 100644
--- a/ash/accelerators/accelerator_controller.cc
+++ b/ash/accelerators/accelerator_controller.cc
@@ -427,13 +427,8 @@ bool AcceleratorController::AcceleratorPressed(
         oak::ShowOakWindow();
       break;
     case NEXT_IME:
-      if (ime_control_delegate_.get()) {
-        ime_control_delegate_->HandleNextIme();
-        // We shouldn't consume Shift+Alt. crbug.com/123720
-        // TODO(yusukes): We might be able to remove the hack when issue 123856
-        // is fixed.
-        return false;
-      }
+      if (ime_control_delegate_.get())
+        return ime_control_delegate_->HandleNextIme();
       break;
     case PREVIOUS_IME:
       if (ime_control_delegate_.get())