Change AccountManagerHelper initialization

chrome/android/javatests/src/org/chromium/chrome/browser/signin/SigninHelperTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/signin/SigninHelperTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/signin/SigninHelperTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/signin/SigninHelperTest.java
index 4fd197bcd515910224e65e0959aac27137afa441..870fa5e966923809d2be8b91b372e8598d30de64 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/signin/SigninHelperTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/signin/SigninHelperTest.java
@@ -8,7 +8,6 @@ import android.accounts.Account;
 import android.support.test.InstrumentationRegistry;
 import android.support.test.filters.SmallTest;
 
-import org.junit.After;
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
@@ -39,13 +38,8 @@ public class SigninHelperTest {
                 InstrumentationRegistry.getInstrumentation().getTargetContext());
         mEventChecker = new MockChangeEventChecker();
 
-        mAccountManager = new FakeAccountManagerDelegate(mContext);
-        AccountManagerHelper.overrideAccountManagerHelperForTests(mContext, mAccountManager);
-    }
-
-    @After
-    public void tearDown() {
-        AccountManagerHelper.resetAccountManagerHelperForTests();
+        mAccountManager = new FakeAccountManagerDelegate();
+        AccountManagerHelper.overrideAccountManagerHelperForTests(mAccountManager);
     }
 
     @Test