Fix NetworkChangeNotifierTest.testIsProcessBoundToNetwork for Android Lollipop

The test calls ConnectivityManager.getActiveNetwork() which is an Android M API.

Bug: 786423
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Id26b4eb49294a35129fc9cc300084ee293403ca5
Reviewed-on: https://chromium-review.googlesource.com/777299Reviewed-by: Maria Khomenko <mariakhomenko@chromium.org>
Commit-Queue: Maria Khomenko <mariakhomenko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517870}

net/android/javatests/src/org/chromium/net/NetworkChangeNotifierTest.java

@@ -40,6 +40,7 @@ import org.chromium.base.library_loader.LibraryLoader;
 import org.chromium.base.library_loader.LibraryProcessType;
 import org.chromium.base.test.BaseJUnit4ClassRunner;
 import org.chromium.base.test.util.Feature;
+import org.chromium.base.test.util.MinAndroidSdkLevel;
 import org.chromium.net.NetworkChangeNotifierAutoDetect.ConnectivityManagerDelegate;
 import org.chromium.net.NetworkChangeNotifierAutoDetect.NetworkState;
 import org.chromium.net.NetworkChangeNotifierAutoDetect.WifiManagerDelegate;
@@ -820,10 +821,8 @@ public class NetworkChangeNotifierTest {
     @Test
     @MediumTest
     @Feature({"Android-AppBase"})
+    @MinAndroidSdkLevel(Build.VERSION_CODES.LOLLIPOP)
     public void testNetworkCallbacks() throws Exception {
-        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
-            return;
-        }
         // Setup NetworkChangeNotifierAutoDetect
         final TestNetworkChangeNotifierAutoDetectObserver observer =
                 new TestNetworkChangeNotifierAutoDetectObserver();
@@ -960,10 +959,8 @@ public class NetworkChangeNotifierTest {
     @Test
     @MediumTest
     @Feature({"Android-AppBase"})
+    @MinAndroidSdkLevel(Build.VERSION_CODES.M)
     public void testIsProcessBoundToNetwork() throws Exception {
-        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
-            return;
-        }
         ConnectivityManager connectivityManager =
                 (ConnectivityManager) InstrumentationRegistry.getTargetContext().getSystemService(
                         Context.CONNECTIVITY_SERVICE);