Fix Cronet compilation and test errors.

components/cronet/android/sample/javatests/src/org/chromium/cronet_sample_apk/CronetSamplePreconditionsTest.java

Index: components/cronet/android/sample/javatests/src/org/chromium/cronet_sample_apk/CronetSamplePreconditionsTest.java
diff --git a/components/cronet/android/sample/javatests/src/org/chromium/cronet_sample_apk/CronetSamplePreconditionsTest.java b/components/cronet/android/sample/javatests/src/org/chromium/cronet_sample_apk/CronetSamplePreconditionsTest.java
deleted file mode 100644
index 3002f80eb41858e8b004c0807addbb15c86e653f..0000000000000000000000000000000000000000
--- a/components/cronet/android/sample/javatests/src/org/chromium/cronet_sample_apk/CronetSamplePreconditionsTest.java
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package org.chromium.cronet_sample_apk;
-
-import android.content.Context;
-import android.os.PowerManager;
-import android.test.suitebuilder.annotation.Smoke;
-
-import org.chromium.base.test.util.Feature;
-
-/**
- * Test that verifies preconditions for tests to run.
- */
-public class CronetSamplePreconditionsTest extends CronetSampleTestBase {
-    @Smoke
-    @Feature({"TestInfrastructure"})
-    public void testScreenIsOn() throws Exception {
-        PowerManager pm = (PowerManager)getInstrumentation().getContext()
-                .getSystemService(Context.POWER_SERVICE);
-
-        assertTrue("Many tests will fail if the screen is not on.",
-                pm.isScreenOn());
-    }
-}