Add EF_IS_REPEAT flag to KeyEvent to handle repeated accelerators correctly.

ash/accelerators/nested_accelerator_delegate.cc

Index: ash/accelerators/nested_accelerator_delegate.cc
diff --git a/ash/accelerators/nested_accelerator_delegate.cc b/ash/accelerators/nested_accelerator_delegate.cc
index 9d30f43f2b9d32b17397e15761250dace812bb54..2fc3438c87aa2499c66810ea1cc63cc4a3c32907 100644
--- a/ash/accelerators/nested_accelerator_delegate.cc
+++ b/ash/accelerators/nested_accelerator_delegate.cc
@@ -62,11 +62,6 @@ NestedAcceleratorDelegate::Result NestedAcceleratorDelegate::ProcessAccelerator(
       ash::Shell::GetInstance()->accelerator_controller();
   if (!accelerator_controller)
     return RESULT_NOT_PROCESSED;
-
-  // Fill out context object so AcceleratorController will know what
-  // was the previous accelerator or if the current accelerator is repeated.
-  Shell::GetInstance()->accelerator_controller()->context()->UpdateContext(
-      accelerator);
   return accelerator_controller->Process(accelerator) ? RESULT_PROCESSED
                                                       : RESULT_NOT_PROCESSED;
 }