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

ios/web/navigation/navigation_item_impl_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.
 
+#include "ios/web/navigation/navigation_item_impl.h"
+
+#include <memory>
+
 #include "base/logging.h"
 #include "base/mac/scoped_nsobject.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/strings/sys_string_conversions.h"
-#include "ios/web/navigation/navigation_item_impl.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 
 namespace web {
 namespace {
 
 static NSString* const kHTTPHeaderKey1 = @"key1";
 static NSString* const kHTTPHeaderKey2 = @"key2";
 static NSString* const kHTTPHeaderValue1 = @"value1";
 static NSString* const kHTTPHeaderValue2 = @"value2";
 
 class NavigationItemTest : public PlatformTest {
  protected:
   void SetUp() override {
     item_.reset(new web::NavigationItemImpl());
     item_->SetURL(GURL("http://init.test"));
     item_->SetTransitionType(ui::PAGE_TRANSITION_AUTO_BOOKMARK);
     item_->SetTimestamp(base::Time::Now());
     item_->AddHttpRequestHeaders(@{kHTTPHeaderKey1 : kHTTPHeaderValue1});
     item_->SetPostData([@"Test data" dataUsingEncoding:NSUTF8StringEncoding]);
   }
 
   // The NavigationItemImpl instance being tested.
-  scoped_ptr<NavigationItemImpl> item_;
+  std::unique_ptr<NavigationItemImpl> item_;
 };
 
 // TODO(rohitrao): Add and adapt tests from NavigationEntryImpl.
 TEST_F(NavigationItemTest, Dummy) {
   const GURL url("http://init.test");
   item_->SetURL(url);
   EXPECT_TRUE(item_->GetURL().is_valid());
 }
 
 // Tests that copied NavigationItemImpls create copies of data members that are
@@ skipping 57 matching lines @@
   item_->RemoveHttpRequestHeaderForKey(kHTTPHeaderKey1);
   EXPECT_NSEQ(@{kHTTPHeaderKey2 : kHTTPHeaderValue2},
               item_->GetHttpRequestHeaders());
 
   item_->RemoveHttpRequestHeaderForKey(kHTTPHeaderKey2);
   EXPECT_FALSE(item_->GetHttpRequestHeaders());
 }
 
 }  // namespace
 }  // namespace web