Delete ViewPagerAndroid JS and BUCK targets

Summary:
After the experiment in D21198302 ships to 100% and that code is deleted, we no longer need ViewPagerAndroid anywhere in FB so it can be deleted.

This is distinct from deleting the native side of the component, which resides in open-source.

Changelog: [Internal]

Differential Revision: D21211134

fbshipit-source-id: 610e09792b079d34acbfcec836fde58a0b3648a7

ReactAndroid/src/main/java/com/facebook/react/shell/MainReactPackage.java

@@ -60,7 +60,6 @@
 import com.facebook.react.views.text.frescosupport.FrescoBasedReactTextInlineImageViewManager;
 import com.facebook.react.views.textinput.ReactTextInputManager;
 import com.facebook.react.views.view.ReactViewManager;
-import com.facebook.react.views.viewpager.ReactViewPagerManager;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -187,7 +186,6 @@ public List<ViewManager> createViewManagers(ReactApplicationContext reactContext
     viewManagers.add(new ReactTextInputManager());
     viewManagers.add(new ReactTextViewManager());
     viewManagers.add(new ReactViewManager());
-    viewManagers.add(new ReactViewPagerManager());
     viewManagers.add(new ReactVirtualTextViewManager());
 
     return viewManagers;