Revert "Lacros: Enable IME."

This reverts commit 68dcf80e.

Reason for revert: Breaks copy/paste: https://bugs.chromium.org/p/chromium/issues/detail?id=1144289

Original change's description:
> Lacros: Enable IME.
>
> Bug: 1133732, 1123705
> Test: Ran Lacros locally.
> Change-Id: Id74573390f287512a4455636e7b636255df4e025
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2503528
> Reviewed-by: James Cook <jamescook@chromium.org>
> Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#821320}

TBR=jamescook@chromium.org,hidehiko@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1133732
Bug: 1123705
Change-Id: I087969af40be61dc325325c91f0502fc18e191dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2515204Reviewed-by: Erik Chen <erikchen@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823402}

chrome/browser/chromeos/crosapi/browser_manager.cc

@@ -317,7 +317,6 @@ void BrowserManager::StartWithLogFile(base::ScopedFD logfd) {
                                    "--enable-oop-rasterization",
                                    "--lang=en-US",
                                    "--enable-crashpad",
-                                   "--enable-wayland-ime",
                                    "--enable-webgl-image-chromium",
                                    "--breakpad-dump-location=" + crash_dir};