Upgrade from Chromium 74.0.3729.131 to Chromium 75.0.3770.38

[mkarolin]

QA Notes

Affected areas:

• Check extensions/components UI and functionality (rewards, shields, etc).
• Check extensions/components updating.
• Check WebUI pages (settings, extensions).
• Check Avatar menu.
• Check theme functionality.
• Check for extra or broken branding elements.

This is a major Chromium version bump, please do full passes.

[btlechowski]

Verification passed on

Brave	0.65.107 Chromium: 75.0.3770.38 (Official Build) beta (64-bit)
Revision	3860105745f2b12537da9e9f048f14c3f52ba970-refs/branch-heads/3770@{#618}
OS	Windows 10 OS Version 1803 (Build 17134.523)

We will perform full passes in separate issues.

Verification passed on

• Logged Edit person setting is missing  #4615

Verification PASSED on macOS 10.14.15 x64 using the following build:

Brave	0.65.112 Chromium: 75.0.3770.38 (Official Build) beta(64-bit)
Revision	3860105745f2b12537da9e9f048f14c3f52ba970-refs/branch-heads/3770@{#618}
OS	Mac OS X

[kjozwiak]

Manual passes are being done in the following issues:

• Manual test run on Linux for 0.65.x - Beta #4399 (Linux)
• Manual test run on Windows x64 for 0.65.x - Beta #4398 (Windows)
• Manual test run on OS X for 0.65.x - Beta #4397 (macOS)