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This CL removes ash::ShellDelegate::GetDeprecatedAcceleratorImage().
This is only used in accelerator_controller.cc as an argument of
system_notifier::CreateSystemNotification(), which is ignored.

This CL also replaces system_notifier::CreateSystemNotification() by
message_center::Notification::CreateSystemNotification(), because the
former function just forwards to the latter.

IDR_BLUETOOTH_KEYBOARD is not removed, because it's still used in
chrome/browser/resources/chromeos/login/oobe_screen_hid_detection.html

BUG=757703

Change-Id: I92f5a982c817cec34f8d508a11cf813a1caec5fb
Reviewed-on: https://chromium-review.googlesource.com/826663Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524293}