Change method of activity tracking done in ActivityStatus.

testing/android/java/src/org/chromium/native_test/ChromeNativeTestActivity.java

Index: testing/android/java/src/org/chromium/native_test/ChromeNativeTestActivity.java
diff --git a/testing/android/java/src/org/chromium/native_test/ChromeNativeTestActivity.java b/testing/android/java/src/org/chromium/native_test/ChromeNativeTestActivity.java
index 6486a14f3cb8108f531baf44e8aac1722b2abe1f..b8e41c830ddd934d526dbcce435b1c9879da52ab 100644
--- a/testing/android/java/src/org/chromium/native_test/ChromeNativeTestActivity.java
+++ b/testing/android/java/src/org/chromium/native_test/ChromeNativeTestActivity.java
@@ -7,23 +7,18 @@ package org.chromium.native_test;
 import android.app.Activity;
 import android.content.Context;
 import android.os.Bundle;
-import android.os.Environment;
 import android.os.Handler;
 import android.util.Log;
 
-import org.chromium.base.ChromiumActivity;
 import org.chromium.base.PathUtils;
 import org.chromium.base.PowerMonitor;
-
 // TODO(cjhopman): This should not refer to content. NativeLibraries should be moved to base.
 import org.chromium.content.app.NativeLibraries;
 
-import java.io.File;
-
 // Android's NativeActivity is mostly useful for pure-native code.
 // Our tests need to go up to our own java classes, which is not possible using
 // the native activity class loader.
-public class ChromeNativeTestActivity extends ChromiumActivity {
+public class ChromeNativeTestActivity extends Activity {
     private static final String TAG = "ChromeNativeTestActivity";
     private static final String EXTRA_RUN_IN_SUB_THREAD = "RunInSubThread";
     // We post a delayed task to run tests so that we do not block onCreate().