Convert //extensions/browser/api from scoped_ptr to std::unique_ptr

extensions/browser/api/document_scan/document_scan_api_unittest.cc

 // 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 "extensions/browser/api/document_scan/document_scan_api.h"
 
 #include <string>
 #include <vector>
 
 #include "extensions/browser/api/document_scan/mock_document_scan_interface.h"
@@ skipping 88 matching lines @@
 TEST_F(DocumentScanScanFunctionTest, Success) {
   std::vector<DocumentScanInterface::ScannerDescription> scanner_list;
   scanner_list.push_back(DocumentScanInterface::ScannerDescription());
   EXPECT_CALL(*document_scan_interface_, ListScanners(_))
       .WillOnce(InvokeListScannersCallback(scanner_list, ""));
   const char kScanData[] = "A beautiful picture";
   const char kMimeType[] = "img/encaustic";
   EXPECT_CALL(*document_scan_interface_, Scan(_, _, _, _))
       .WillOnce(InvokeScanCallback(kScanData, kMimeType, ""));
   function_->set_user_gesture(true);
-  scoped_ptr<base::DictionaryValue> result(
+  std::unique_ptr<base::DictionaryValue> result(
       RunFunctionAndReturnDictionary(function_, "[{}]"));
   ASSERT_NE(nullptr, result.get());
   document_scan::ScanResults scan_results;
   EXPECT_TRUE(document_scan::ScanResults::Populate(*result, &scan_results));
   EXPECT_THAT(scan_results.data_urls, testing::ElementsAre(kScanData));
   EXPECT_EQ(kMimeType, scan_results.mime_type);
 }
 
 }  // namespace api
 
 }  // namespace extensions