Fix for 2305181: "shift A shift M" quickly gives Am instead of AM

There was a delayed changing of keyboard to lowercase after typing
a shifted letter that was triggering after the user pressed shift
again. Removed the delayed message when user hits shift.

src/com/android/inputmethod/latin/LatinIME.java

@@ -673,6 +673,7 @@ public class LatinIME extends InputMethodService
     }
 
     private void handleShift() {
+        mHandler.removeMessages(MSG_UPDATE_SHIFT_STATE);
         Keyboard currentKeyboard = mInputView.getKeyboard();
         if (mKeyboardSwitcher.isAlphabetMode()) {
             // Alphabet keyboard