Remove trailing web_callbacks.h include from websocket_sb_handshake_throttle.h

This is a left over of https://crrev.com/c/1540096.

BUG=945851
TBR=vakh@chromium.org

Change-Id: Ic6ed3933a5310f812892be8dadc782c00be25313
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1692149Reviewed-by: Antonio Gomes <tonikitoo@igalia.com>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#676412}

components/safe_browsing/renderer/websocket_sb_handshake_throttle.h

@@ -15,7 +15,6 @@
 #include "base/time/time.h"
 #include "components/safe_browsing/common/safe_browsing.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
-#include "third_party/blink/public/platform/web_callbacks.h"
 #include "third_party/blink/public/platform/websocket_handshake_throttle.h"
 #include "url/gurl.h"