links inside welcome screen should open in another tab

[cezaraugusto]

Test Cases

• ensure that chrome://welcome/ is being launched in a brand new profile
• ensure that Skip welcome tour is working as expected
• ensure Enable Rewards opens chrome://rewards/ in a new tab
• ensure Import Now opens chrome://settings/importData in a new tab
• ensure Preferences opens chrome://settings/ in a new tab
• ensure Done closes chrome://welcome/ and opens brave://newtab
• ensured that each dot moves the welcome page to the next stage of the welcome page

Original Reported Issue

🦁

[NejcZdovc]

this is dupe of #1739

[srirambv]

Verification Passed on

Brave	0.57.3 Chromium: 70.0.3538.67 (Official Build) dev (64-bit)
Revision	9ab0cfab84ded083718d3a4ff830726efd38869f-refs/branch-heads/3538@{#1002}
OS	Linux

• Verified all links in welcome screen open in individual new tabs

Verification Passed on

Brave	0.55.21 Chromium: 70.0.3538.77 (Official Build) (64-bit)
Revision	0f6ce0b0cd63a12cb4eccea3637b1bc9a29148d9-refs/branch-heads/3538@{#1039}
OS	Windows

• Verified all links in welcome screen open in individual new tabs

Went through verification using the following build under macOS 10.13.6 x64 - PASSED

Brave	0.55.21 Chromium: 70.0.3538.77 (Official Build) (64-bit)
Revision	0f6ce0b0cd63a12cb4eccea3637b1bc9a29148d9-refs/branch-heads/3538@{#1039}
OS	Mac OS X

[bbondy]

Updated milestone to hotfix2 since this will be included in 0.55.x hotfix2.

[kjozwiak]

Clearing flags as we'll need to check this with the new RC2 just incase. Should be a quick verification either way.

[btlechowski]

Verification Passed on

Brave	0.55.22 Chromium: 70.0.3538.77 (Official Build) (64-bit)
Revision	0f6ce0b0cd63a12cb4eccea3637b1bc9a29148d9-refs/branch-heads/3538@{#1039}
OS	Windows 7 x64

• ensured that chrome://welcome/ is being launched in a brand new profile
• ensured that Skip welcome tour is working as expected
• ensured Enable Rewards opens chrome://rewards/ in a new tab
• ensured Import Now opens chrome://settings/importData in a new tab
• ensured Preferences opens chrome://settings/ in a new tab
• ensured Done closes chrome://welcome/ and opens brave://newtab
• ensured that each dot moves the welcome page to the next stage of the welcome page

Went through verification using the following build under macOS 10.13.6 x64 - PASSED

Brave	0.55.22 Chromium: 70.0.3538.77 (Official Build) (64-bit)
Revision	0f6ce0b0cd63a12cb4eccea3637b1bc9a29148d9-refs/branch-heads/3538@{#1039}
OS	Mac OS X

• ensured that chrome://welcome/ is being launched in a brand new profile
• ensured that Skip welcome tour is working as expected
• ensured Enable Rewards opens chrome://rewards/ in a new tab
• ensured Import Now opens chrome://settings/importData in a new tab
• ensured Preferences opens chrome://settings/ in a new tab
• ensured Done closes chrome://welcome/ and opens brave://newtab
• ensured that each dot moves the welcome page to the next stage of the welcome page

Brave	0.55.22 Chromium: 70.0.3538.77 (Official Build) (64-bit)
Revision	0f6ce0b0cd63a12cb4eccea3637b1bc9a29148d9-refs/branch-heads/3538@{#1039}
OS	Linux

• Verified that brave://welcome/ is being launched in a brand new profile
• Verified that Skip welcome tour is working as expected
• Verified Enable Rewards opens brave://rewards/ in a new tab
• Verified Import Now opens brave://settings/importData in a new tab
• Verified Preferences opens brave://settings/ in a new tab
• Verified Done closes brave://welcome/ and opens brave://newtab
• Verified that individual welcome page intro can be clicked individually