Remove unnecessary include that is causing build flakiness.

TBR=treib@chromium.org

Change-Id: I1e3310dc4a689bb6f1fb862b2c3a03b575da2b77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1769046Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Auto-Submit: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689954}

weblayer/common/web_content_client.cc

@@ -9,7 +9,6 @@
 #include "content/app/strings/grit/content_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
-#include "weblayer/shell/grit/web_shell_resources.h"
 
 namespace weblayer {