Allow ChromeIdentityService in ChromeBrowserProvider to be overriden.

ios/public/provider/chrome/browser/signin/chrome_identity_service.mm

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ios/public/provider/chrome/browser/signin/chrome_identity_service.h"
 
 #include "ios/public/provider/chrome/browser/signin/chrome_identity_interaction_manager.h"
 
 namespace ios {
 
 ChromeIdentityService::ChromeIdentityService() {}
 
 ChromeIdentityService::~ChromeIdentityService() {
   FOR_EACH_OBSERVER(Observer, observer_list_,
                     OnChromeIdentityServiceWillBeDestroyed());
 }
 
+void ChromeIdentityService::DismissDialogs() {}
+
+bool ChromeIdentityService::HandleApplicationOpenURL(UIApplication* application,
+                                                     NSURL* url,
+                                                     NSDictionary* options) {
+  return false;
+}
+
 base::scoped_nsobject<UINavigationController>
 ChromeIdentityService::NewAccountDetails(
     ChromeIdentity* identity,
     id<ChromeIdentityBrowserOpener> browser_opener) {
   return base::scoped_nsobject<UINavigationController>();
 }
 
 base::scoped_nsobject<UINavigationController>
 ChromeIdentityService::NewWebAndAppSettingDetails(
     ChromeIdentity* identity,
@@ skipping 103 matching lines @@
     NSDictionary* user_info) {
   FOR_EACH_OBSERVER(Observer, observer_list_,
                     OnAccessTokenRefreshFailed(identity, user_info));
 }
 
 void ChromeIdentityService::FireProfileDidUpdate(ChromeIdentity* identity) {
   FOR_EACH_OBSERVER(Observer, observer_list_, OnProfileUpdate(identity));
 }
 
 }  // namespace ios