Move CancellationSignal to android.os package.

Bug: 6427830
Change-Id: I39451bb1e1d4a8d976ed1c671234f0c8c61658dd
diff --git a/core/java/android/database/sqlite/SQLiteDatabase.java b/core/java/android/database/sqlite/SQLiteDatabase.java
index 7bd0c8d..e2d44f2 100644
--- a/core/java/android/database/sqlite/SQLiteDatabase.java
+++ b/core/java/android/database/sqlite/SQLiteDatabase.java
@@ -16,16 +16,16 @@
 
 package android.database.sqlite;
 
-import android.content.CancellationSignal;
 import android.content.ContentValues;
-import android.content.OperationCanceledException;
 import android.database.Cursor;
 import android.database.DatabaseErrorHandler;
 import android.database.DatabaseUtils;
 import android.database.DefaultDatabaseErrorHandler;
 import android.database.SQLException;
 import android.database.sqlite.SQLiteDebug.DbStats;
+import android.os.CancellationSignal;
 import android.os.Looper;
+import android.os.OperationCanceledException;
 import android.text.TextUtils;
 import android.util.EventLog;
 import android.util.Log;