Roll engine 05a0074580e1..ba51408257b6 (3 commits) (#38960)

git@github.com:flutter/engine.git/compare/05a0074580e1...ba51408257b6

git log 05a0074580e1..ba51408257b6 --no-merges --oneline
2019-08-21 chinmaygarde@google.com Reference the Flutter framework instead of the dylib in iOS tests. (flutter/engine#11337)
2019-08-21 jonahwilliams@google.com Reland remove kernel sdk script (flutter/engine#10814)
2019-08-21 stuartmorgan@google.com Fix change_install_name.py to be GN-friendly (flutter/engine#11309)

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bin/internal/engine.version

-05a0074580e1e3ae45bc6df6f2b28db097458ac8
+ba51408257b6f261219781ada411f3dcb2da38f8