Merge "Update enter and send icons for LXX_Dark" into lmp-preview-dev

java/res/drawable-hdpi/sym_keyboard_return_lxx_dark.png

java/res/drawable-hdpi/sym_keyboard_send_lxx_dark.png

java/res/drawable-mdpi/sym_keyboard_return_lxx_dark.png

java/res/drawable-mdpi/sym_keyboard_send_lxx_dark.png

java/res/drawable-xhdpi/sym_keyboard_return_lxx_dark.png

java/res/drawable-xhdpi/sym_keyboard_send_lxx_dark.png

java/res/drawable-xxhdpi/sym_keyboard_return_lxx_dark.png

java/res/drawable-xxhdpi/sym_keyboard_send_lxx_dark.png