Upgrade from Chromium 78.0.3904.97 to Chromium 78.0.3904.108 (1.2.x)

[mkarolin]

Fixes #6987
Related PR: brave/brave-core#4021

Uplift from #6990

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Verified that these changes build without errors on
  • Android
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that these changes pass automated tests (unit, browser, security tests) on
  • iOS
  • Linux
  • macOS
  • Windows
• Ran git rebase master (if needed).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Requested a security/privacy review as needed.
• Public documentation has been updated as necessary. For instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protection-Mode
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-compatibility-issues-with-tracking-protection

Test Plan:

Reviewer Checklist:

• New files have MPL-2.0 license header.
• Request a security/privacy review as needed.
• Adequate test coverage exists to prevent regressions.

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on.
• All relevant documentation has been updated.

[bsclifton]

Linux still running, Windows ran into a weird linker error:
https://ci.brave.com/job/brave-browser-build-pr/job/PR-7010/3/execution/node/368/log/

13:38:35  FAILED: chrome.dll chrome.dll.lib chrome.dll.pdb 
13:38:35  ninja -t msvc -e environment.x64 -- ../../third_party/llvm-build/Release+Asserts/bin/lld-link.exe /nologo /IMPLIB:./chrome.dll.lib /DLL /OUT:./chrome.dll /PDB:./chrome.dll.pdb @./chrome.dll.rsp
13:38:35  lld-link: error: undefined symbol: public: void __cdecl ManagePasswordsState::OnPasswordAutofilled(class std::__1::map<class std::__1::basic_string<wchar_t, struct std::__1::char_traits<wchar_t>, class std::__1::allocator<wchar_t>>, struct autofill::PasswordForm const *, struct std::__1::less<class std::__1::basic_string<wchar_t, struct std::__1::char_traits<wchar_t>, class std::__1::allocator<wchar_t>>>, class std::__1::allocator<struct std::__1::pair<class std::__1::basic_string<wchar_t, struct std::__1::char_traits<wchar_t>, class std::__1::allocator<wchar_t>> const, struct autofill::PasswordForm const *>>> const &, class GURL const &, class std::__1::vector<struct autofill::PasswordForm const *, class std::__1::allocator<struct autofill::PasswordForm const *>> const *)
13:38:35  >>> referenced by ../../chrome/browser/ui/passwords/manage_passwords_ui_controller.cc
13:38:35  >>>               ui.lib(manage_passwords_ui_controller.obj)

[bsclifton]

Restarting for Windows...

[mkarolin]

Windows passed on CI retry.

[bsclifton]

++