[Copyright] Fix copyright headers in Chromium.

This CL updates copyright headers in ['/android_webview', '/weblayer']
to the current format:

// Copyright $year The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

Generated with:

./tools/git/mffr.py -g "*.cc" -g "*.h" -g "*.mm" -g "*.py" -g "*.js" -g "*.java" -g "*.mojom" -g "*.xml" -g "*.jinja" -g "*.gn" -g "*.gni" -g "*.star" -g "*.icon" -g "*.ts" -g "*.css" -g "*.json" -g "*.html" -g "*.proto" -g "*.idl" -g "*.pins" -g "*.yml" -g "*.sh" 'Chromium Authors\. All rights reserved\.' 'Chromium Authors'

Additional manual fixes were made to files that have extra "(C)"
strings, or where line breaks were wrong.

This CL was uploaded by git cl split.

R=boliu@chromium.org

Bug: 1457007
Change-Id: I58c83e79e96f41e5298b4a77fbb1618a6000aa96
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4823994
Auto-Submit: Mark Foltz <mfoltz@chromium.org>
Commit-Queue: Bo Liu <boliu@chromium.org>
Reviewed-by: Bo Liu <boliu@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1189775}