Code: void SharedWorkerDevToolsAgentHost::AttachSession(DevToolsSession* session) {
   session->AddHandler(std::make_unique<protocol::InspectorHandler>());
   session->AddHandler(std::make_unique<protocol::NetworkHandler>(GetId()));
   session->AddHandler(std::make_unique<protocol::SchemaHandler>());
   session->SetRenderer(worker_host_ ? worker_host_->process_id() : -1, nullptr);
   if (state_ == WORKER_READY)
     session->AttachToAgent(EnsureAgent());
 }

Vulnerability Type: Exec Code 
CWE ID: CWE-20
Summary: Allowing the chrome.debugger API to attach to Web UI pages in DevTools in Google Chrome prior to 67.0.3396.62 allowed an attacker who convinced a user to install a malicious extension to execute arbitrary code via a crafted Chrome Extension.
Commit Message: [DevTools] Do not allow chrome.debugger to attach to web ui pages

If the page navigates to web ui, we force detach the debugger extension.

TBR=alexclarke@chromium.org

Bug: 798222
Change-Id: Idb46c2f59e839388397a8dfa6ce2e2a897698df3
Reviewed-on: https://chromium-review.googlesource.com/935961
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540916}