Upgrade from Chromium 75.0.3770.100 to Chromium 76.0.3809.62

[mkarolin]

QA Notes

Affected areas:

• Check rewards functionality (generally operational).
• Check ads functionality (generally operational).
• Check tor functionality (generally operational).
• Check brave://settings left hand side menu for correctness and for being operational.
• Check Avatar menu.
• Check download drawer items for correct layout.
• Check theme switching (that it works and redraws all elements correctly).
• Check that if a credit card save popup doesn't suggest signing into Google after saving.
• Check for extra or broken branding elements.

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

[GeetaSarvadnya]

Verification passed on

Brave	0.67.112 Chromium: 76.0.3809.62 (Official Build) beta (64-bit)
Revision	7b77856b3aa34d72f246d12340fc1ded8b2c0e83-refs/branch-heads/3809@{#798}
OS	Windows 10 OS Version 1803 (Build 17134.523)

• The functionalities mentioned in Upgrade from Chromium 75.0.3770.100 to Chromium 76.0.3809.62 #5083 (comment) will be tested in the complete manual run

Verification passed on

Brave	0.67.114 Chromium: 76.0.3809.62 (Official Build) beta (64-bit)
Revision	7b77856b3aa34d72f246d12340fc1ded8b2c0e83-refs/branch-heads/3809@{#798}
OS	Ubuntu 18.04 LTS

Verified passed with

Brave	0.67.112 Chromium: 76.0.3809.62 (Official Build) beta (64-bit)
Revision	7b77856b3aa34d72f246d12340fc1ded8b2c0e83-refs/branch-heads/3809@{#798}
OS	Mac OS X

[bsclifton]

marking as QA/No as this has been superseded by #5299