Command line args are listed twice after upgrade

[GeetaSarvadnya]

Description

Command line args are listed twice after upgrade

Steps to Reproduce

1. Clean profile 1.3.115
2. Upgrade to 1.3.116
3. Open chrome://version
4. Command line args are listed twice after upgrade

Actual result:

Command line args are listed twice after upgrade

Expected result:

Command line args should be listed once after upgrade

Reproduces how often:

Always

Brave version (brave://version info)

Brave	1.3.116 Chromium: 80.0.3987.106 (Official Build) (64-bit)
Revision	f68069574609230cf9b635cd784cfb1bf81bb53a-refs/branch-heads/3987@{#882}
OS	Windows 10 OS Version 1803 (Build 17134.1006)

Version/Channel Information:

• Can you reproduce this issue with the current release? No
• Can you reproduce this issue with the beta channel? Yes
• Can you reproduce this issue with the dev channel? No
• Can you reproduce this issue with the nightly channel? No

Other Additional Information:

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

Miscellaneous Information:

cc: @brave/legacy_qa @darkdh @rebron @bsclifton

[srirambv]

On Linux, this happens when you set the flag to Disabled and then set it back to Default.

[LaurenWags]

Can't reproduce using STR from description on macOS, but can reproduce using #8290 (comment) on both clean and upgrade profiles.

Brave	1.3.116 Chromium: 80.0.3987.106 (Official Build) (64-bit)
Revision	f68069574609230cf9b635cd784cfb1bf81bb53a-refs/branch-heads/3987@{#882}
OS	macOS Version 10.14.6 (Build 18G3020)

[GeetaSarvadnya]

Verification passed on

Brave	1.7.67 Chromium: 80.0.3987.149 (Official Build) beta (64-bit)
Revision	5f4eb224680e5d7dca88504586e9fd951840cac6-refs/branch-heads/3987_137@{#16}
OS	Windows 10 OS Version 1803 (Build 17134.1006)

• Verified STR from the description, there is no --disable-sync duplicate flag
  
• Verified the test plan from Do not append --disable-sync when it already has one brave-core#4679
  

Verification passed on

Brave	1.7.70 Chromium: 80.0.3987.149 (Official Build) dev (64-bit)
Revision	5f4eb224680e5d7dca88504586e9fd951840cac6-refs/branch-heads/3987_137@{#16}
OS	Ubuntu 18.04 LTS

• Verified the test plan from Do not append --disable-sync when it already has one brave-core#4679
  

---

Verification passed with

Brave	1.7.71 Chromium: 80.0.3987.149 (Official Build) dev (64-bit)
Revision	5f4eb224680e5d7dca88504586e9fd951840cac6-refs/branch-heads/3987_137@{#16}
OS	macOS Version 10.14.6 (Build 18G3020)

• Reproduced the issue using 1.5.115. Upgraded to 1.7.x. Confirmed only one --disable-sync listed on brave://version
• Verified test plan from Do not append --disable-sync when it already has one brave-core#4679 on a clean profile with 1.7.x
• Verified STR from description
• Verified Command line args are listed twice after upgrade #8290 (comment)