Remove ChromeBrowserProvider::RegisterProfilePrefs().

ios/chrome/browser/device_sharing/device_sharing_manager_unittest.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/chrome/browser/device_sharing/device_sharing_manager.h"
 
 #include <memory>
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 23 matching lines @@
  protected:
   DeviceSharingManagerTest()
       : PlatformTest(),
         kTestURL1("http://test_sharing_1.html"),
         kTestURL2("http://test_sharing_2.html") {}
 
   void SetUp() override {
     PlatformTest::SetUp();
     TestChromeBrowserState::Builder mainBrowserStateBuilder;
     chrome_browser_state_ = mainBrowserStateBuilder.Build();
-    sync_preferences::TestingPrefServiceSyncable* prefs =
-        chrome_browser_state_->GetTestingPrefService();
-    [HandoffManager registerBrowserStatePrefs:prefs->registry()];
     sharing_manager_.reset([[TestDeviceSharingManager alloc] init]);
   }
 
   void TearDown() override {
     [sharing_manager_ updateBrowserState:NULL];
     sharing_manager_.reset();
   }
 
   const GURL kTestURL1;
   const GURL kTestURL2;
@@ skipping 50 matching lines @@
 TEST_F(DeviceSharingManagerTest, DisableHandoffViaPrefs) {
   [sharing_manager_ updateBrowserState:chrome_browser_state_.get()];
   EXPECT_TRUE([sharing_manager_ handoffManager]);
   sync_preferences::TestingPrefServiceSyncable* prefs =
       chrome_browser_state_->GetTestingPrefService();
   prefs->SetBoolean(prefs::kIosHandoffToOtherDevices, false);
   EXPECT_FALSE([sharing_manager_ handoffManager]);
 }
 
 }  // namespace