chore: cherry-pick d4564dcc2520 from chromium #22979
Reland: Sequentialise access to callbacks in DWriteFontLookupTableBuilder
This reland fixes the sequenced task runner initialisation. Set the
Since there may be multiple instance of DWriteFontProxyImpl instantiated
Sequentialise and guard access to pending_callbacks_ with a separate
Remove explicit configuration of the FontUniqueNameBrowserTest cache
Notes: Security: Backport fix for buffer underflow in DWrite.
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