Chris Bracken 21fd6fb32a Correct typos, adopt US spellings (flutter/engine#9081)
Corects a bnuch of typeos throughout teh engien codebsae. Also makes
a couple minor Commonwealth -> US spelling adjustments for consistency
with the rest of Flutter's codebase.

Made use of `misspell` tool:
https://github.com/client9/misspell
2019-05-25 13:14:46 -07:00
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