Cleanup unsed code on AccessibilityInfoModule

Summary:
This diff cleansup unused code on AccessibilityInfoModule class

changelog: [Android][Deprecated] Remove code used by deprecated Android API levels

Reviewed By: JoshuaGross

Differential Revision: D22771912

fbshipit-source-id: f32808fa93f75c10324e8875b85fe4e541b284b8

Author: mdvacca

ReactAndroid/src/main/java/com/facebook/react/modules/accessibilityinfo/AccessibilityInfoModule.java

@@ -90,12 +90,10 @@ public String getName() {
     return "AccessibilityInfo";
   }
 
+  @TargetApi(Build.VERSION_CODES.KITKAT)
   private boolean getIsReduceMotionEnabledValue() {
     String value =
-        Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1
-            ? null
-            : Settings.Global.getString(
-                mContentResolver, Settings.Global.TRANSITION_ANIMATION_SCALE);
+        Settings.Global.getString(mContentResolver, Settings.Global.TRANSITION_ANIMATION_SCALE);
 
     return value != null && value.equals("0.0");
   }
@@ -139,11 +137,10 @@ private void updateAndSendTouchExplorationChangeEvent(boolean enabled) {
   }
 
   @Override
+  @TargetApi(Build.VERSION_CODES.KITKAT)
   public void onHostResume() {
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
-      mAccessibilityManager.addTouchExplorationStateChangeListener(
-          mTouchExplorationStateChangeListener);
-    }
+    mAccessibilityManager.addTouchExplorationStateChangeListener(
+        mTouchExplorationStateChangeListener);
 
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
       Uri transitionUri = Settings.Global.getUriFor(Settings.Global.TRANSITION_ANIMATION_SCALE);
@@ -155,15 +152,12 @@ public void onHostResume() {
   }
 
   @Override
+  @TargetApi(Build.VERSION_CODES.KITKAT)
   public void onHostPause() {
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
-      mAccessibilityManager.removeTouchExplorationStateChangeListener(
-          mTouchExplorationStateChangeListener);
-    }
+    mAccessibilityManager.removeTouchExplorationStateChangeListener(
+        mTouchExplorationStateChangeListener);
 
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
-      mContentResolver.unregisterContentObserver(animationScaleObserver);
-    }
+    mContentResolver.unregisterContentObserver(animationScaleObserver);
   }
 
   @Override