flushCookieStore() shouldn't be in the public API after all.

See change Ic4433400, where I reorganised the framework so that
cookies are synced automatically by CookieSyncManager.

Change-Id: Ide0afbe60c6ca0601e7337051c6aa98522a8b0bb
diff --git a/src/com/android/browser/Controller.java b/src/com/android/browser/Controller.java
index b26e9f0..5642d4d 100644
--- a/src/com/android/browser/Controller.java
+++ b/src/com/android/browser/Controller.java
@@ -560,7 +560,6 @@
             Log.e(LOGTAG, "BrowserActivity is already paused.");
             return;
         }
-        CookieManager.getInstance().flushCookieStore();
         mActivityPaused = true;
         Tab tab = mTabControl.getCurrentTab();
         if (tab != null) {