Fix test crashes related to AccountManagerHelper.

chrome/android/javatests/src/org/chromium/chrome/browser/preferences/password/SavePasswordsPreferencesTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/preferences/password/SavePasswordsPreferencesTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/preferences/password/SavePasswordsPreferencesTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/preferences/password/SavePasswordsPreferencesTest.java
index c3e911612b39205493b18f07e4fd0d0b3711dc44..e042f3b0a6b507f7caa13b8ac24c66165c77b780 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/preferences/password/SavePasswordsPreferencesTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/preferences/password/SavePasswordsPreferencesTest.java
@@ -8,7 +8,6 @@ import android.support.test.InstrumentationRegistry;
 import android.support.test.filters.SmallTest;
 
 import org.junit.Assert;
-import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -21,7 +20,7 @@ import org.chromium.chrome.browser.preferences.ChromeSwitchPreference;
 import org.chromium.chrome.browser.preferences.PrefServiceBridge;
 import org.chromium.chrome.browser.preferences.Preferences;
 import org.chromium.chrome.browser.preferences.PreferencesTest;
-import org.chromium.content.browser.test.NativeLibraryTestRule;
+import org.chromium.chrome.browser.test.ChromeBrowserTestRule;
 
 /**
  * Tests for the "Save Passwords" settings screen.
@@ -29,12 +28,7 @@ import org.chromium.content.browser.test.NativeLibraryTestRule;
 @RunWith(BaseJUnit4ClassRunner.class)
 public class SavePasswordsPreferencesTest {
     @Rule
-    public NativeLibraryTestRule mActivityTestRule = new NativeLibraryTestRule();
-
-    @Before
-    public void setUp() throws Exception {
-        mActivityTestRule.loadNativeLibraryAndInitBrowserProcess();
-    }
+    public final ChromeBrowserTestRule mBrowserTestRule = new ChromeBrowserTestRule();
 
     /**
      * Ensure that the on/off switch in "Save Passwords" settings actually enables and disables