Shields read-only view should show real resources blocked

[cezaraugusto]

At the moment it shows a hard-coded version of resources.

Test Plan

1. Fresh profile
2. Open Shields
3. Click "Learn more"
4. Click any resource blocked

What happens

Stats are hard-coded at 2. A hard-coded resource blocked is shown.

What should happen

Should show a list of resources blocked on the current site

[kjozwiak]

@cezaraugusto once this is closed, please add either QA/Yes or QA/No as needed 👍

[GeetaSarvadnya]

Verification passed on

Brave	0.69.113 Chromium: 76.0.3809.100 (Official Build) beta (64-bit)
Revision	ed9d447d30203dc5069e540f05079e493fc1c132-refs/branch-heads/3809@{#990}
OS	Windows 10 OS Version 1803 (Build 17134.523)

• Verified the test plan from allow shields read-only view to show actual resources blocked brave-core#2987
• Verified that the blocked resources count is not hardcoded
• Verified the count of blocked resources is equal to the number of scripts blocked in panel ( copied blocked resources from the panel and counted manually)
• Verified that resources or scripts blocked are referred to the current website

Verified passed with

Brave	0.69.116 Chromium: 76.0.3809.100 (Official Build) beta (64-bit)
Revision	ed9d447d30203dc5069e540f05079e493fc1c132-refs/branch-heads/3809@{#990}
OS	Mac OS X

• Verified the test plan from allow shields read-only view to show actual resources blocked brave-core#2987
• Verified that the blocked resources count is not hardcoded
• Verified the count of blocked resources is equal to the number of scripts blocked in panel
• Verified that resources or scripts blocked are referred to the current website

Verification passed on

Brave	0.69.119 Chromium: 76.0.3809.132 (Official Build) beta (64-bit)
Revision	fd1acc410994a7a68ac25bc77513d443f3130860-refs/branch-heads/3809@{#1035}
OS	Ubuntu 18.04 LTS

• Verified the test plan from allow shields read-only view to show actual resources blocked brave-core#2987
• Verified that the blocked resources count is not hardcoded
• Verified the count of blocked resources is equal to the number of scripts blocked in panel
• Verified that resources or scripts blocked are referred to the current website