Use the right @Nullable in ChromeTabUtils.

TBR=tedchoc@chromium.org

Change-Id: I7f70d7ec1adc281a8e0750690c2d9ec75d7ad307
Reviewed-on: https://chromium-review.googlesource.com/c/1342804
Commit-Queue: Donn Denman <donnd@chromium.org>
Reviewed-by: Donn Denman <donnd@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609399}

chrome/test/android/javatests/src/org/chromium/chrome/test/util/ChromeTabUtils.java

@@ -5,6 +5,7 @@
 package org.chromium.chrome.test.util;
 
 import android.app.Instrumentation;
+import android.support.annotation.Nullable;
 import android.support.test.InstrumentationRegistry;
 import android.text.TextUtils;
 import android.view.View;
@@ -45,8 +46,6 @@ import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 
-import javax.annotation.Nullable;
-
 /**
  * A utility class that contains methods generic to all Tabs tests.
  */