Fix crash on API level 16

Thread.quitSafely is not a supported method on API 16. Fixed by
using the alternate quit() method.

Change-Id: I711ce90a61a45ece67309db24d96e012361e7513
diff --git a/src/com/android/browser/util/ThreadedCursorAdapter.java b/src/com/android/browser/util/ThreadedCursorAdapter.java
index 23dd307..5a0407b 100644
--- a/src/com/android/browser/util/ThreadedCursorAdapter.java
+++ b/src/com/android/browser/util/ThreadedCursorAdapter.java
@@ -209,7 +209,7 @@
         if (mThread != null) {
             HandlerThread thread = mThread;
             mThread = null;
-            thread.quitSafely();
+            thread.quit();
         }
     }