Two banners at the same time

[NejcZdovc]

Description

Steps to Reproduce

1. enable rewards
2. go to a site and open tip banner
3. open new window, load a site and open tip banner
4. banner from step 2 will be updated with banner from site 3

Actual result:

Same happens if you open it in one tab and then in another and then come back to the initial tab, banner will be wrong

Expected result:

banner should be per tab

Reproduces how often:

Brave version (brave://version info)

Reproducible on current release:

• Does it reproduce on brave-browser dev/beta builds?

Website problems only:

• Does the issue resolve itself when disabling Brave Shields?
• Is the issue reproducible on the latest version of Chrome?

Additional Information

cc @petemill

[btlechowski]

Verification passed on

Brave	0.61.37 Chromium: 73.0.3683.39 (Official Build) beta (64-bit)
Revision	cc53b0e12fcaf42e4bab8d6c23bd4fb7aae99f6c-refs/branch-heads/3683@{#413}
OS	Windows 7 Service Pack 1 Build 7601.24312

Used test plan from brave/brave-core#1490

Verification passed on

Brave	0.61.40 Chromium: 73.0.3683.39 (Official Build) beta (64-bit)
Revision	cc53b0e12fcaf42e4bab8d6c23bd4fb7aae99f6c-refs/branch-heads/3683@{#413}
OS	Linux mint

• Verified test plan from Adds support for multiple banners at the same time brave-core#1490

Verification PASSED on macOS 10.14.3 x64 using the following build:

Brave	0.61.45 Chromium: 73.0.3683.39 (Official Build) beta(64-bit)
Revision	cc53b0e12fcaf42e4bab8d6c23bd4fb7aae99f6c-refs/branch-heads/3683@{#413}
OS	Mac OS X

• Went through the test plan outlined under Adds support for multiple banners at the same time brave-core#1490