wake lock: Remove entry for event_target_modules.h from DEPS

The Wake Lock spec has dropped all event handling from the text, and we
adapted our implementation accordingly in commit 0463bfde ("wake lock: Adapt
to the latest version of the spec (9a17e1f48)"), so the entry in DEPS is no
longer needed.

Bug: 257511
Change-Id: I69e4ce2c921b672951474aac233597c72089e490
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1643552
Auto-Submit: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665983}

third_party/blink/renderer/modules/wake_lock/DEPS

@@ -3,7 +3,6 @@ include_rules = [
   "+services/device/public/mojom",
   "+services/device/public/interfaces/constants.mojom-blink.h",
   "+services/device/public/mojom/wake_lock.mojom-blink.h",
-  "+third_party/blink/renderer/modules/event_target_modules.h",
 ]
 
 specific_include_rules = {