[NTP Snippets] SnippetsController cleanup: remove SigninStateObserver

chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsController.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsController.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsController.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsController.java
index 28975a63650ae7157011cf3556e4b99fcb8e27a1..64b33f042072b08056f60aec4f154cf721ef26bb 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsController.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsController.java
@@ -4,28 +4,19 @@
 
 package org.chromium.chrome.browser.ntp.snippets;
 
-import android.content.Context;
-
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.browser.profiles.Profile;
-import org.chromium.chrome.browser.signin.SigninManager;
-import org.chromium.chrome.browser.signin.SigninManager.SignInStateObserver;
 
 /**
  * The main controller for calling into the native snippets component to fetch snippets.
  */
-public class SnippetsController implements SignInStateObserver {
+public class SnippetsController {
     private static SnippetsController sInstance;
 
     private long mNativeSnippetsController;
 
-    public SnippetsController(Context applicationContext) {
-        // |applicationContext| can be null in tests.
-        if (applicationContext != null) {
-            SigninManager.get(applicationContext).addSignInStateObserver(this);
-        }
-    }
+    public SnippetsController() {}
 
     /**
      * Fetches new snippets.
@@ -37,25 +28,16 @@ public class SnippetsController implements SignInStateObserver {
     /**
      * Retrieve the singleton instance of this class.
      *
-     * @param context the current context.
      * @return the singleton instance.
      */
-    public static SnippetsController get(Context context) {
+    public static SnippetsController get() {
         ThreadUtils.assertOnUiThread();
         if (sInstance == null) {
-            sInstance = new SnippetsController(context.getApplicationContext());
+            sInstance = new SnippetsController();
         }
         return sInstance;
     }
 
-    @Override
-    public void onSignedIn() {
-        fetchSnippets();
-    }
-
-    @Override
-    public void onSignedOut() {}
-
     @VisibleForTesting
     public static void setInstanceForTesting(SnippetsController instance) {
         sInstance = instance;