API 29: Fix changed nullability

DropBoxManager.getNextEntry: This wasn't supposed to be @NonNull, null indicates all tags.

Bug: 123221743
Test: make api-stubs-docs-check-last-released-api
Change-Id: Icf1527518240bfb4ed26ec29525d24f6521fdc56
Merged-In: Icf1527518240bfb4ed26ec29525d24f6521fdc56
(cherry picked from commit 41a6d51c017c4b3c33fdc7f87b6a9216f3a824a9)
diff --git a/29/public/api/android.txt b/29/public/api/android.txt
index 90dd0de..615ce6c 100644
--- a/29/public/api/android.txt
+++ b/29/public/api/android.txt
@@ -32350,7 +32350,7 @@
     method public void addData(String, byte[], int);
     method public void addFile(String, java.io.File, int) throws java.io.IOException;
     method public void addText(String, String);
-    method @Nullable public android.os.DropBoxManager.Entry getNextEntry(@NonNull String, long);
+    method @Nullable public android.os.DropBoxManager.Entry getNextEntry(String, long);
     method public boolean isTagEnabled(String);
     field public static final String ACTION_DROPBOX_ENTRY_ADDED = "android.intent.action.DROPBOX_ENTRY_ADDED";
     field public static final String EXTRA_TAG = "tag";