Revert of [Android] Update all Robolectric tests to Robolectric 3.0

chrome/android/junit/src/org/chromium/chrome/browser/media/router/ChromeMediaRouterTestBase.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/media/router/ChromeMediaRouterTestBase.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/media/router/ChromeMediaRouterTestBase.java b/chrome/android/junit/src/org/chromium/chrome/browser/media/router/ChromeMediaRouterTestBase.java
index 3c0ac3c3e3d8c10bb4bafde29887d89f5113de53..51487e69c76865f7634f019a7fbd146ff990926d 100644
--- a/chrome/android/junit/src/org/chromium/chrome/browser/media/router/ChromeMediaRouterTestBase.java
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/media/router/ChromeMediaRouterTestBase.java
@@ -11,8 +11,13 @@
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.spy;
 
+import android.app.ActivityManager;
+
 import org.chromium.base.CommandLine;
 import org.junit.Before;
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+import org.robolectric.shadows.ShadowActivityManager;
 import org.robolectric.shadows.ShadowLog;
 
 /**
@@ -51,12 +56,26 @@
     protected static final int TAB_ID2 = 2;
     protected static final int REQUEST_ID1 = 1;
     protected static final int REQUEST_ID2 = 2;
+    protected static boolean sIsLowRamDevice;
     protected ChromeMediaRouter mChromeMediaRouter;
     protected MediaRouteProvider mRouteProvider;
+
+    /**
+     * Robolectric's ShadowActivityManager implementation in order to extend
+     * isLowRamDevice and be able to instrument the tests.
+     */
+    @Implements(ActivityManager.class)
+    public static class FakeActivityManager extends ShadowActivityManager {
+        @Implementation
+        public boolean isLowRamDevice() {
+            return sIsLowRamDevice;
+        }
+    }
 
     @Before
     public void setUp() {
         ShadowLog.stream = System.out;
+        sIsLowRamDevice = false;
         mChromeMediaRouter = spy(new ChromeMediaRouter(0));
         mRouteProvider = mock(MediaRouteProvider.class);
         doReturn(true).when(mRouteProvider).supportsSource(anyString());