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When I attempted  to submit the field trial test for the Windows native
spell checker integration, the try bots picked up several crashes in
existing tests when the native spell checker flags are enabled in
Chrome:
https://cr-buildbucket.appspot.com/build/8891251817173916304

The crashes were caused by the use of raw pointers instead of weak
pointers, because the SpellcheckHunspellDictionary object was deleted
by the time the callback from PlatformSupportsLanguage() was invoked.

Change-Id: I8ac2afa9b66a11a2846a086f23d024ce380f77eb
Bug: 463364,
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003087Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: Guillaume Jenkins <gujen@google.com>
Auto-Submit: Guillaume Jenkins <gujen@google.com>
Cr-Commit-Position: refs/heads/master@{#732910}