Convert //ios from scoped_ptr to std::unique_ptr.

ios/web/web_state/js/crw_js_window_id_manager_unittest.mm

 // Copyright 2014 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.
 
 #import "ios/web/web_state/js/crw_js_window_id_manager.h"
 
 #include "base/mac/scoped_nsobject.h"
+#include "base/memory/ptr_util.h"
 #import "ios/web/public/test/crw_test_js_injection_receiver.h"
 #import "ios/web/public/test/js_test_util.h"
 #include "ios/web/public/test/scoped_testing_web_client.h"
 #include "ios/web/public/web_client.h"
 #import "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 
 namespace {
 
 class JSWindowIDManagerTest : public PlatformTest {
  public:
-  JSWindowIDManagerTest() : web_client_(make_scoped_ptr(new web::WebClient)) {}
+  JSWindowIDManagerTest() : web_client_(base::WrapUnique(new web::WebClient)) {}
 
  protected:
   void SetUp() override {
     PlatformTest::SetUp();
     receiver_.reset([[CRWTestJSInjectionReceiver alloc] init]);
     manager_.reset([[CRWJSWindowIdManager alloc] initWithReceiver:receiver_]);
   }
 
   // Required for CRWJSWindowIdManager creation.
   base::scoped_nsobject<CRWTestJSInjectionReceiver> receiver_;
@@ skipping 12 matching lines @@
   base::scoped_nsobject<CRWTestJSInjectionReceiver> receiver2(
       [[CRWTestJSInjectionReceiver alloc] init]);
   base::scoped_nsobject<CRWJSWindowIdManager> manager2(
       [[CRWJSWindowIdManager alloc] initWithReceiver:receiver2]);
   [manager2 inject];
   NSString* windowID2 = [manager2 windowId];
   EXPECT_NSNE(windowID, windowID2);
 }
 
 }  // namespace