Refactor NetworkScoreAppManager for testing.

Test: runtest frameworks-services && runtest frameworks-core
Change-Id: Ie2172009e9ba0438050488fe0aea6408f852c2c2
diff --git a/core/tests/coretests/src/android/net/NetworkScorerAppManagerTest.java b/core/tests/coretests/src/android/net/NetworkScorerAppManagerTest.java
index e7aca78..02c2517 100644
--- a/core/tests/coretests/src/android/net/NetworkScorerAppManagerTest.java
+++ b/core/tests/coretests/src/android/net/NetworkScorerAppManagerTest.java
@@ -42,6 +42,8 @@
     @Mock private Context mMockContext;
     @Mock private PackageManager mMockPm;
 
+    private NetworkScorerAppManager mNetworkScorerAppManager;
+
     @Override
     public void setUp() throws Exception {
         super.setUp();
@@ -54,6 +56,7 @@
 
         MockitoAnnotations.initMocks(this);
         Mockito.when(mMockContext.getPackageManager()).thenReturn(mMockPm);
+        mNetworkScorerAppManager = new NetworkScorerAppManager(mMockContext);
     }
 
     public void testGetAllValidScorers() throws Exception {
@@ -81,7 +84,7 @@
         setScorers(scorers);
 
         Iterator<NetworkScorerAppData> result =
-                NetworkScorerAppManager.getAllValidScorers(mMockContext).iterator();
+                mNetworkScorerAppManager.getAllValidScorers().iterator();
 
         assertTrue(result.hasNext());
         NetworkScorerAppData next = result.next();