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

chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/ShadowGcmNetworkManager.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/ShadowGcmNetworkManager.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/ShadowGcmNetworkManager.java b/chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/ShadowGcmNetworkManager.java
index 36271515b6367b031a55fa220a2bda2a57ed627e..b05e848597beddc6421f13a907447d9af6c90e58 100644
--- a/chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/ShadowGcmNetworkManager.java
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/ShadowGcmNetworkManager.java
@@ -18,34 +18,34 @@
  */
 @Implements(GcmNetworkManager.class)
 public class ShadowGcmNetworkManager {
-    private Task mTask;
-    private Task mCanceledTask;
+    private static Task sTask;
+    private static Task sCanceledTask;
 
     @Implementation
-    public void schedule(Task task) {
+    public static void schedule(Task task) {
         // Capture the string part divisions so we can check them.
-        mTask = task;
+        sTask = task;
     }
 
     @Implementation
-    public void cancelTask(String tag, Class<? extends GcmTaskService> gcmTaskService) {
-        if (mTask != null && mTask.getTag().equals(tag)
-                && mTask.getServiceName().equals(gcmTaskService.getName())) {
-            mCanceledTask = mTask;
-            mTask = null;
+    public static void cancelTask(String tag, Class<? extends GcmTaskService> gcmTaskService) {
+        if (sTask != null && sTask.getTag().equals(tag)
+                && sTask.getServiceName().equals(gcmTaskService.getName())) {
+            sCanceledTask = sTask;
+            sTask = null;
         }
     }
 
-    public Task getScheduledTask() {
-        return mTask;
+    public static Task getScheduledTask() {
+        return sTask;
     }
 
-    public Task getCanceledTask() {
-        return mCanceledTask;
+    public static Task getCanceledTask() {
+        return sCanceledTask;
     }
 
-    public void clear() {
-        mTask = null;
-        mCanceledTask = null;
+    public static void clear() {
+        sTask = null;
+        sCanceledTask = null;
     }
 }