Crash on Mac Nightly

[mkarolin]

Reported by @ShivanKaul:
I just got a crash when clicking on Brave Shields in Nightly for https://d3ward.github.io/toolz/adblock.html. I got it twice in a row but seems fine now.

Brave Version: 1.38.60  Chromium: 100.0.4896.46
Operating System: Mac OS X 11.6.0
Uploaded Crash Report ID:	70f40200-a473-f107-0000-000000000000

The crash stack tip:

1
<…>
‎/Users/jenkins/jenkins/workspace/brave-browser-build-macos-x64-nightly/src/out/Release/../../ui/base/resource/resource_bundle.cc:1162
2
l10n_util::GetStringUTF16
‎/Users/jenkins/jenkins/workspace/brave-browser-build-macos-x64-nightly/src/out/Release/../../ui/base/resource/resource_bundle.cc:771
3
…::ToolTask::ToolTask
‎/Users/jenkins/jenkins/workspace/brave-browser-build-macos-x64-nightly/src/out/Release/../../chrome/browser/task_manager/providers/web_contents/tool_task.cc:17
4
…::ToolTag::CreateTask
‎/Users/jenkins/jenkins/workspace/brave-browser-build-macos-x64-nightly/src/out/Release/../../buildtools/third_party/libc++/trunk/include/__memory/unique_ptr.h:725
5
…::WebContentsEntry::CreateTaskForFrame
‎/Users/jenkins/jenkins/workspace/brave-browser-build-macos-x64-nightly/src/out/Release/../../chrome/browser/task_manager/providers/web_contents/web_contents_task_provider.cc:337
6
…::WebContentsObserverList::NotifyObservers<…>
‎/Users/jenkins/jenkins/workspace/brave-browser-build-macos-x64-nightly/src/out/Release/../../content/browser/web_contents/web_contents_impl.h:1516
7
<…>

[LaurenWags]

cc @rebron since this is 1.38.x / shields v2

[rebron]

cc: @nullhook @petemill

[nullhook]

this should be fixed via brave/brave-core#12984

[kjozwiak]

Above requires 1.38.102 or higher for 1.38.x verification.

[stephendonner]

Verified PASSED using

Brave	1.38.103 Chromium: 100.0.4896.127 (Official Build) beta (x86_64)
Revision	ff0d0695743e65305d7194f9bd309e5e1c824aa0-refs/branch-heads/4896_88@{#4}
OS	macOS Version 11.6.5 (Build 20G527)

With both existing and new profiles, loaded https://d3ward.github.io/toolz/adblock.html and toggled Shields DOWN/UP without issue/crashing.