Remove unused DEPS exception

Bug: none
Change-Id: I4c5626a76b302c846a76dae70853d018af255bb9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2486096
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Auto-Submit: Avi Drissman <avi@chromium.org>
Reviewed-by: Kevin McNee <mcnee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818914}

chrome/browser/renderer_host/DEPS

@@ -2,8 +2,6 @@ include_rules = [
   # renderer_host is intended to support the content layer's renderers. No
   # reference to the tab contents is allowed.
   "-chrome/browser/tab_contents",
-  # Allow tab_util.h for GetWebContentsByID.
-  "+chrome/browser/tab_contents/tab_util.h",
   "+components/page_load_metrics/browser",
   "+third_party/ocmock/OCMock/OCMock.h",
   "+third_party/ocmock/ocmock_extensions.h",