Revert "Reland "[iOS]Change AccountMenuCoordinator parent class""

This reverts commit 659f4a0adc15b3cb549c8d88357d7476a93e8fa5.

Reason for revert:
LUCI Bisection has identified this change as the cause of a test failure. See the analysis: https://ci.chromium.org/ui/p/chromium/bisection/test-analysis/b/5138575801712640

Sample build with failed test: https://ci.chromium.org/b/8715521572782366497
Affected test(s):
[ninja://ios/chrome/test/earl_grey2:ios_chrome_settings_eg2tests_module/ManageSyncSettingsTestCase/testSignOutFromAccountFromAccountMenu](https://ci.chromium.org/ui/test/chromium/ninja:%2F%2Fios%2Fchrome%2Ftest%2Fearl_grey2:ios_chrome_settings_eg2tests_module%2FManageSyncSettingsTestCase%2FtestSignOutFromAccountFromAccountMenu?q=VHash%3A31534deaba62d344)
[ninja://ios/chrome/test/earl_grey2:ios_chrome_settings_eg2tests_module/ManageSyncSettingsTestCase/testSignOutFromAccountFromAccountMenu](https://ci.chromium.org/ui/test/chromium/ninja:%2F%2Fios%2Fchrome%2Ftest%2Fearl_grey2:ios_chrome_settings_eg2tests_module%2FManageSyncSettingsTestCase%2FtestSignOutFromAccountFromAccountMenu?q=VHash%3A64e81fbde3fbd45e)

If this is a false positive, please report it at http://b.corp.google.com/createIssue?component=1199205&description=Analysis%3A+https%3A%2F%2Fci.chromium.org%2Fui%2Fp%2Fchromium%2Fbisection%2Ftest-analysis%2Fb%2F5138575801712640&format=PLAIN&priority=P3&title=Wrongly+blamed+https%3A%2F%2Fchromium-review.googlesource.com%2Fc%2Fchromium%2Fsrc%2F%2B%2F6515319&type=BUG

Original change's description:
> Reland "[iOS]Change AccountMenuCoordinator parent class"
>
> This reverts commit 011310c28c7731432e0bb2bc51d1a833a5753d5d.
>
> Reason for revert: Tested locally, and the test still seems to work correctly. No idea of the cause of the test issue, but let’s try again.
>
> Bug: 381444097
> Original change's description:
> > Revert "[iOS]Change AccountMenuCoordinator parent class"
> >
> > This reverts commit 3777145bdbf63dfb38ff574a94b25cfc2b454843.
> >
> > Reason for revert:
> > LUCI Bisection has identified this change as the cause of a test failure. See the analysis: https://ci.chromium.org/ui/p/chromium/bisection/test-analysis/b/6263102594088960
> >
> > Sample build with failed test: https://ci.chromium.org/b/8716140076041568673
> > Affected test(s):
> > [ninja://ios/chrome/test/earl_grey2:ios_chrome_settings_eg2tests_module/ManageSyncSettingsTestCase/testSignOutFromAccountFromAccountMenu](https://ci.chromium.org/ui/test/chromium/ninja:%2F%2Fios%2Fchrome%2Ftest%2Fearl_grey2:ios_chrome_settings_eg2tests_module%2FManageSyncSettingsTestCase%2FtestSignOutFromAccountFromAccountMenu?q=VHash%3A31534deaba62d344)
> >
> > If this is a false positive, please report it at http://b.corp.google.com/createIssue?component=1199205&description=Analysis%3A+https%3A%2F%2Fci.chromium.org%2Fui%2Fp%2Fchromium%2Fbisection%2Ftest-analysis%2Fb%2F6263102594088960&format=PLAIN&priority=P3&title=Wrongly+blamed+https%3A%2F%2Fchromium-review.googlesource.com%2Fc%2Fchromium%2Fsrc%2F%2B%2F6449972&type=BUG
> >
> > Original change's description:
> > > [iOS]Change AccountMenuCoordinator parent class
> > >
> > > Before this CL the AccountMenuCoordinator directly implemented
> > > SigninCoordinator. It used to be necessary due to restriction in the
> > > AddAccountCoordinator. Now that this restriction is gone, we can
> > > simplify some part of the code by ensuring that AccountMenuCoordinator
> > > directly extends ChromeCoordinator.
> > >
> > > Bug: 381444097
> > > Change-Id: Id1a17471d9566372731cd182e6bd3e4cb8996b48
> > > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6449972
> > > Reviewed-by: Mark Cogan <marq@chromium.org>
> > > Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
> > > Auto-Submit: Arthur Milchior <arthurmilchior@chromium.org>
> > > Commit-Queue: Arthur Milchior <arthurmilchior@chromium.org>
> > > Cr-Commit-Position: refs/heads/main@{#1454033}
> > >
> >
> > Bug: 381444097
> > No-Presubmit: true
> > No-Tree-Checks: true
> > No-Try: true
> > Change-Id: Iab47237decf7c4c6c165d208d782cb8f8df13f3b
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6503578
> > Owners-Override: Justin Cohen <justincohen@chromium.org>
> > Reviewed-by: Federica Germinario <fedegermi@google.com>
> > Reviewed-by: Justin Cohen <justincohen@chromium.org>
> > Commit-Queue: Federica Germinario <fedegermi@google.com>
> > Cr-Commit-Position: refs/heads/main@{#1454944}
>
> Bug: 381444097
> Change-Id: Ib194fcac195842e8d315ab4e3051aa37906f6caf
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6515319
> Reviewed-by: Mark Cogan <marq@chromium.org>
> Commit-Queue: Arthur Milchior <arthurmilchior@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1456970}
>

Bug: 381444097
Bug: 381444097
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I1dbc2169f8acebdc70c154bb8f6d4b5aaa59dfc4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6518908
Owners-Override: Noémie St-Onge <noemies@google.com>
Reviewed-by: Andrea Gomez <andreaxg@google.com>
Commit-Queue: Noémie St-Onge <noemies@google.com>
Reviewed-by: Noémie St-Onge <noemies@google.com>
Cr-Commit-Position: refs/heads/main@{#1457540}