sec-ch-ua client hint should use the same product name regardless of the channel.

[mkarolin]

This is a follow up to #24009 (brave/brave-core#14155).

The code to generate the hint calls version_info::GetProductName() which on MacOS returns different values based on the channel (Beta, Nightly).

@pes10k suggested to the value should be invariable for all channels.

Test plan:

See brave/brave-variations#332

[kjozwiak]

The above requires 1.45.87 or higher for 1.45.x verification 👍 @brave/qa-team note that this is behind Griffin and at the time of verification, might only be enabled on the Nightly channel. Please use brave://flags to enable brave://flags/#allow-certain-client-hints.

[stephendonner]

Verified PASSED using

Brave	1.45.87 Chromium: 106.0.5249.91 (Official Build) beta (x86_64)
Revision	fa96d5f07b1177d1bf5009f647a5b8c629762157-refs/branch-heads/5249@{#707}
OS	macOS Version 11.7 (Build 20G817)

Steps:

1. installed 1.45.87
2. launched Brave
3. opened brave://flags
4. set Allow certain request client hints to Enabled
5. clicked on the Relaunch button
6. loaded brave.com with the Developer Tools open to the Network panel
7. clicked on brave.com
8. examined the Request headers and confirmed the following was present:

sec-ch-ua: "Chromium";v="106", "Brave";v="106", "Not;A=Brand";v="99"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "macOS"

brave://flags	brave.com headers

[MadhaviSeelam]

Verification PASSED using

Brave | 1.45.87 Chromium: 106.0.5249.91 (Official Build) beta (64-bit)
-- | --
Revision | fa96d5f07b1177d1bf5009f647a5b8c629762157-refs/branch-heads/5249@{#707}
OS | Windows 11 Version 21H2 (Build 22000.978)

Steps:

1. installed 1.45.87
2. launched Brave
3. opened brave://flags
4. set Allow certain request client hints to Enabled
5. clicked on the Relaunch button
6. loaded brave.com with the Developer Tools open to the Network panel
7. clicked on brave.com
8. examined the Request headers and confirmed the following was present:

sec-ch-ua: "Chromium";v="106", "Brave";v="106", "Not;A=Brand";v="99"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "Windows"

step 3-5	step 8

[btlechowski]

Verification passed on

Brave	1.45.90 Chromium: 106.0.5249.103 (Official Build) beta (64-bit)
Revision	182570408a1f25ab2731ef5f283b918df9b9f956-refs/branch-heads/5249_91@{#6}
OS	Ubuntu 18.04 LTS

Steps:

1. installed 1.45.x
2. launched Brave
3. opened brave://flags
4. set Allow certain request client hints to Enabled
5. clicked on the Relaunch button
6. loaded brave.com with the Developer Tools open to the Network panel
7. clicked on brave.com
8. examined the Request headers and confirmed the following was present:

sec-ch-ua: "Chromium";v="106", "Brave";v="106", "Not;A=Brand";v="99"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "Linux"

brave://flags	brave.com headers

[Uni-verse]

Verified on Samsung Galaxy S21 & Samsung Galaxy Tab S7 using the following build(s):

Brave	1.45.106 Chromium: 107.0.5304.36 (Official Build) (64-bit) 
Revision	2f9c7a5a1fe357d87e9bc07c65cca9136b3651c5-refs/branch-heads/5304@{#671}
OS	Android 12; Build/SP1A.210812.016

Steps:

1. installed 1.45.x
2. launched Brave
3. opened brave://flags
4. set Allow certain request client hints to Enabled
5. clicked on the Relaunch button
6. loaded brave.com with the Developer Tools open to the Network panel
7. clicked on brave.com

• Verified Android is displayed for platform regardless of the channel

sec-ch-ua: "Brave";v="107", "Chromium";v="107", "Not=A?Brand";v="24"
sec-ch-ua-mobile: ?1
sec-ch-ua-platform: "Android"

Example	Example