content: Remove per-file rules for non-existent files.

The WebDatabase code was moved to //content/browser/web_database.

Change-Id: I4939437108316c3cdb88631bb863e76a44cc8d60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2726824
Auto-Submit: Victor Costan <pwnall@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#858452}

content/browser/renderer_host/OWNERS

@@ -24,10 +24,6 @@ per-file *mac*=ccameron@chromium.org
 # Android platform code.
 per-file *android*=boliu@chromium.org
 
-# WebSQL.
-per-file web_database_*=jsbell@chromium.org
-per-file web_database_*=pwnall@chromium.org
-
 # Embedded Frame Sinks (eg. Offscreen Canvas).
 per-file embedded_frame_sink*.*=xlai@chromium.org
 per-file embedded_frame_sink*.*=junov@chromium.org