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

ios/web/web_state/ui/crw_wk_script_message_router_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/ui/crw_wk_script_message_router.h"
 
 #include "base/mac/scoped_block.h"
 #include "base/mac/scoped_nsobject.h"
+#include "base/memory/ptr_util.h"
 #include "ios/web/public/test/scoped_testing_web_client.h"
 #include "ios/web/public/test/test_browser_state.h"
 #import "ios/web/public/test/test_web_client.h"
 #import "ios/web/public/web_view_creation_util.h"
 #import "ios/web/test/web_test.h"
 #include "third_party/ocmock/OCMock/OCMock.h"
 #include "third_party/ocmock/gtest_support.h"
 
 namespace {
 
 // Returns WKScriptMessage mock.
 id GetScriptMessageMock(WKWebView* web_view, NSString* name) {
   id result = [OCMockObject mockForClass:[WKScriptMessage class]];
   [[[result stub] andReturn:web_view] webView];
   [[[result stub] andReturn:name] name];
   return result;
 }
 
 // Test fixture for CRWWKScriptMessageRouter.
 class CRWWKScriptMessageRouterTest : public web::WebTest {
  public:
   CRWWKScriptMessageRouterTest()
-      : web_client_(make_scoped_ptr(new web::WebClient)) {}
+      : web_client_(base::WrapUnique(new web::WebClient)) {}
 
  protected:
   void SetUp() override {
     web::WebTest::SetUp();
     // Mock WKUserContentController object.
     controller_mock_.reset(
         [[OCMockObject mockForClass:[WKUserContentController class]] retain]);
     [controller_mock_ setExpectationOrderMatters:YES];
 
     // Create testable CRWWKScriptMessageRouter.
@@ skipping 150 matching lines @@
          didReceiveScriptMessage:message1];
   [router_ userContentController:controller_mock_
          didReceiveScriptMessage:message2];
   [router_ userContentController:controller_mock_
          didReceiveScriptMessage:message3];
 
   EXPECT_EQ(3, last_called_handler);
 }
 
 }  // namespace