Use Promises for screen.lockOrientation().

LayoutTests/screen_orientation/lockOrientation-basic-expected.txt

Index: LayoutTests/screen_orientation/lockOrientation-basic-expected.txt
diff --git a/LayoutTests/screen_orientation/lockOrientation-basic-expected.txt b/LayoutTests/screen_orientation/lockOrientation-basic-expected.txt
deleted file mode 100644
index deb6cd0f6f0b413d25cbe275ac5ec5328b7f7ff7..0000000000000000000000000000000000000000
--- a/LayoutTests/screen_orientation/lockOrientation-basic-expected.txt
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@@ -1,20 +0,0 @@
-Basic screen.lockOrientation() / screen.unlockOrientation() testing
-
-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
-
-
-PASS screen.orientation is "portrait-primary"
-PASS screen.unlockOrientation() did not throw exception.
-PASS screen.lockOrientation('any') is true
-PASS screen.lockOrientation('portrait') is true
-PASS screen.lockOrientation('landscape') is true
-PASS screen.lockOrientation('portrait-primary') is true
-PASS screen.lockOrientation('portrait-secondary') is true
-PASS screen.lockOrientation('landscape-primary') is true
-PASS screen.lockOrientation('landscape-secondary') is true
-PASS screen.orientation is "portrait-primary"
-PASS screen.unlockOrientation() did not throw exception.
-PASS successfullyParsed is true
-
-TEST COMPLETE
-