Delete ReactViewPager

Summary:
All ReactViewPager functionality should now be possible by using a ScrollView.

Changelog: [Internal] ReactViewPager has been deprecated on Android and was removed from core as part of LeanCore

Reviewed By: mdvacca

Differential Revision: D21751774

fbshipit-source-id: 292475b9ffe7788b745329d13fd88dc3b613819e

Author: JoshuaGross

ReactAndroid/src/main/java/com/facebook/react/shell/BUCK

@@ -64,7 +64,6 @@ rn_android_library(
         react_native_target("java/com/facebook/react/views/text/frescosupport:frescosupport"),
         react_native_target("java/com/facebook/react/views/textinput:textinput"),
         react_native_target("java/com/facebook/react/views/view:view"),
-        react_native_target("java/com/facebook/react/views/viewpager:viewpager"),
         react_native_target("java/com/facebook/react/module/annotations:annotations"),
         react_native_target("res:shell"),
     ],