Permissions requests should be cancelled when closing a locked connection window

[ryanml]

Original video of the issue:

Test Plan

1. Setup Crypto Wallets
2. Lock the wallet
3. Navigate to a dapp such as cryptokitties.co
4. Click "Start" to connect your wallet
5. Close the popup window without entering your password

Actual

6. You are unable to connect again, seeing errors in the web console

Expected

7. You can open another connection window and connect after unlocking your wallet via the popup

[srirambv]

Verification passed on

Brave	1.16.68 Chromium: 86.0.4240.111 (Official Build) (64-bit)
Revision	b8c36128a06ebad76af51591bfec980224db5522-refs/branch-heads/4240@{#1290}
OS	Linux
Component	1.0.16 dev

• Verified permission request is only prompted once when closing a locked connection window

---

Verification passed on

Brave	1.17.50 Chromium: 86.0.4240.111 (Official Build) dev (64-bit)
Revision	b8c36128a06ebad76af51591bfec980224db5522-refs/branch-heads/4240@{#1290}
OS	Windows 10 OS Version 1809 (Build 17763.1518)
Component	1.0.16 dev

• Verified permission request is only prompted once when closing a locked connection window

---

Verification passed on

Brave	1.18.5 Chromium: 86.0.4240.111 (Official Build) nightly (x86_64)
Revision	b8c36128a06ebad76af51591bfec980224db5522-refs/branch-heads/4240@{#1290}
OS	macOS Version 10.15.7 (Build 19H2)
Component	1.0.16 dev

• Verified permission request is only prompted once when closing a locked connection window