Followup, Fixed import for 833089c8

Fixed missing and extra imports

BUG=411931
TBR=keishi

Review URL: https://codereview.chromium.org/556513002

Cr-Commit-Position: refs/heads/master@{#293743}

content/public/android/javatests/src/org/chromium/content/browser/WebContentsObserverAndroidTest.java

@@ -4,10 +4,8 @@
 
 package org.chromium.content.browser;
 
-import android.test.suitebuilder.annotation.SmallTest;
-
 import org.chromium.base.ThreadUtils;
-import org.chromium.base.test.util.Feature;
+import org.chromium.base.test.util.DisabledTest;
 import org.chromium.base.test.util.UrlUtils;
 import org.chromium.content.browser.test.util.CallbackHelper;
 import org.chromium.content_public.browser.LoadUrlParams;