Convert Pass()→std::move() for iOS build.

ios/chrome/browser/web_resource/web_resource_util_unittest.cc

 // 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/web_resource/web_resource_util.h"
 
 #include <string>
+#include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "ios/web/public/web_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace web_resource {
 
 class WebResourceUtilTest : public testing::Test {
  protected:
   WebResourceUtilTest() : error_called_(false), success_called_(false) {}
   ~WebResourceUtilTest() override {}
 
   WebResourceService::SuccessCallback GetSuccessCallback() {
     return base::Bind(&WebResourceUtilTest::OnParseSuccess,
                       base::Unretained(this));
   }
 
   WebResourceService::ErrorCallback GetErrorCallback() {
     return base::Bind(&WebResourceUtilTest::OnParseError,
                       base::Unretained(this));
   }
 
   // Called on success.
   void OnParseSuccess(scoped_ptr<base::Value> value) {
     success_called_ = true;
-    value_ = value.Pass();
+    value_ = std::move(value);
   }
 
   // Called on error.
   void OnParseError(const std::string& error) {
     error_called_ = true;
     error_ = error;
   }
 
   void FlushBackgroundTasks() {
     // The function is not synchronous, callbacks are not called before flushing
@@ skipping 69 matching lines @@
 
   FlushBackgroundTasks();
 
   // The error callback is called.
   EXPECT_TRUE(error_called_);
   EXPECT_FALSE(success_called_);
   EXPECT_FALSE(error_.empty());
 }
 
 }  // namespace web_resource