Revert "Add Right-To-Left delete icon"

java/res/drawable-hdpi/sym_bkeyboard_delete_rtl.png

java/res/drawable-hdpi/sym_keyboard_delete_rtl.png

java/res/drawable-hdpi/sym_keyboard_delete_rtl_holo.png

java/res/drawable-mdpi/sym_bkeyboard_delete_rtl.png

java/res/drawable-mdpi/sym_keyboard_delete_rtl.png

java/res/drawable-mdpi/sym_keyboard_delete_rtl_holo.png

...es/drawable-sw600dp-hdpi/sym_keyboard_delete_rtl_holo.png

...es/drawable-sw600dp-mdpi/sym_keyboard_delete_rtl_holo.png

...s/drawable-sw600dp-xhdpi/sym_keyboard_delete_rtl_holo.png

java/res/drawable-xhdpi/sym_bkeyboard_delete_rtl.png

java/res/drawable-xhdpi/sym_keyboard_delete_rtl.png

java/res/drawable-xhdpi/sym_keyboard_delete_rtl_holo.png

java/res/values/attrs.xml

java/res/values/keyboard-icons-black.xml

java/res/values/keyboard-icons-ics.xml

java/res/values/keyboard-icons-white.xml

java/res/xml-sw600dp/kbd_key_styles.xml

java/res/xml-sw768dp/kbd_key_styles.xml

java/res/xml/kbd_key_styles.xml

...droid/inputmethod/keyboard/internal/KeyboardIconsSet.java