Fix deps *brave_process* target in //brave/browser/

[Gyuyoung]

Resolves brave/brave-browser#12084.

Resolves

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
• Verified that all lint errors/warnings are resolved (npm run lint, npm run gn_check)
• 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.
• Added appropriate QA labels (QA/Yes or QA/No) to the associated issue
• Added appropriate release note labels (release-notes/include or release-notes/exclude) to the associated issue
• 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-Protections
  • 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
  • https://github.com/brave/brave-browser/wiki/QA-Guide

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
• Verify test plan is specified in PR before merging to source

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.

[Gyuyoung]

This PR needs to include widevine.gni to use enable_widevine guard in line #45. But, it causes below import loop error.

FAILED: build.ninja 
../../buildtools/linux64/gn --root=../.. -q gen .
ERROR //build/config/chrome_build.gni is part of an import loop.
See //brave/browser/sources.gni:8:1: whence it was imported.
import("//third_party/widevine/cdm/widevine.gni")
^-----------------------------------------------
See //brave/build/config/brave_build.gni:6:1: whence it was imported.
import("//brave/browser/sources.gni")
^-----------------------------------
See //build/config/chrome_build.gni:4:1: whence it was imported.
import("//brave/build/config/brave_build.gni")
^--------------------------------------------
See //build/config/compiler/compiler.gni:5:1: whence it was imported.
import("//build/config/chrome_build.gni")
^---------------------------------------
See //BUILD.gn:11:1: whence it was imported.
import("//build/config/compiler/compiler.gni")
^--------------------------------------------
ninja: error: rebuilding 'build.ninja': subcommand failed