cros: Remove outdated DEPS from chrome/browser/ui/ash/DEPS

session_state_delegate_chromeos.(h|cc) don't exist anymore.

TBR=xiyuan@chromium.org

Bug: none
Test: checkdeps passes
Change-Id: I9f258838cf3f5f6e966b53b8954973fa7403e117
Reviewed-on: https://chromium-review.googlesource.com/571963
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486780}

chrome/browser/ui/ash/DEPS

@@ -11,13 +11,3 @@ include_rules = [
   "+mash/shelf/public/interfaces",
   "+media",
 ]
-specific_include_rules = {
-  # Allow ash::SessionStateDelegate for SessionStateDelegateChromeOS.
-  # SessionStateDelegate is deprecated. Chrome code should not use it anymore.
-  # Instead, SessionManager/UserManager/SessionControllerClient should be used.
-  # This is temporary rule before SessionStateDelegate(ChromeOS) can be fully
-  # removed.
-  "session_state_delegate_chromeos\.(cc|h)": [
-    "+ash/session",
-  ]
-}