Roll engine 3606f7bc2d06..ccf5d619b58a (2 commits) (#39015)

git@github.com:flutter/engine.git/compare/3606f7bc2d06...ccf5d619b58a

git log 3606f7bc2d06..ccf5d619b58a --no-merges --oneline
2019-08-21 chinmaygarde@google.com Dry up fixture comparison in embedder unit-tests. (flutter/engine#11359)
2019-08-21 egarciad@google.com Remove engine hash from pom filename (flutter/engine#11356)

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bin/internal/engine.version

-3606f7bc2d0679315995365bd4e22f9192245388
+ccf5d619b58a956303cdd408c7c1ba2c2cf35cbd