Upgrade from Chromium 78.0.3904.108 to Chromium 79.0.3945.56

[mkarolin]

QA tests:

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

Affected areas:

• Avatar button and menu
• Omnibox colors when theme changes
• Bookmark button
• Location bar focus ring, corner radius
• Ad notifications shouldn't have Settings button on Linux and Mac

[LaurenWags]

Verified passed with

Brave	1.1.18 Chromium: 79.0.3945.56 (Official Build) (64-bit)
Revision	73cc6bf591f792b99f8fc7cdfb8addedbd084bf8-refs/branch-heads/3945@{#788}
OS	macOS Version 10.13.6 (Build 17G5019)

• macOS full manual pass completed with: Manual test run on OS X for 1.1.x - Beta #7168
• Encountered and logged the following regressions so far: hovering over a bookmark bar item shows corners as rounded  #7210, ad notifications no longer have a View button #7211, users are prompted to Sign into Brave after saving credit card info #7219, brave://version page shows Chromium logo/name on dark theme #7221

Verification passed on

Brave	1.1.18 Chromium: 79.0.3945.56 (Official Build) (64-bit)
Revision	73cc6bf591f792b99f8fc7cdfb8addedbd084bf8-refs/branch-heads/3945@{#788}
OS	Windows 10 OS Version 1803 (Build 17134.1006)

• Encountered hovering over a bookmark bar item shows corners as rounded  #7210, ad notifications no longer have a View button #7211, users are prompted to Sign into Brave after saving credit card info #7219, brave://version page shows Chromium logo/name on dark theme #7221

Verification passed on

Brave	1.1.18 Chromium: 79.0.3945.56 (Official Build) (64-bit)
Revision	73cc6bf591f792b99f8fc7cdfb8addedbd084bf8-refs/branch-heads/3945@{#788}
OS	Ubuntu 18.04 LTS

• Encountered hovering over a bookmark bar item shows corners as rounded  #7210, ad notifications no longer have a View button #7211, users are prompted to Sign into Brave after saving credit card info #7219, brave://version page shows Chromium logo/name on dark theme #7221

[LaurenWags]

Removed release-notes/include as this was superseded by #7213