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

ios/chrome/browser/memory/memory_metrics.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 "ios/chrome/browser/memory/memory_metrics.h"
 
 #include <mach/mach.h>
 #include <stddef.h>
 #include <stdint.h>
 
+#include <memory>
+
 #include "base/logging.h"
 #include "base/mac/scoped_mach_port.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/process/process_handle.h"
 #include "base/process/process_metrics.h"
 #include "build/build_config.h"
 
 #ifdef ARCH_CPU_64_BITS
 #define cr_vm_region vm_region_64
 #else
 #define cr_vm_region vm_region
 #endif
 
@@ skipping 16 matching lines @@
       host.get(), HOST_VM_INFO, reinterpret_cast<host_info_t>(&vmstat), &count);
   if (result != KERN_SUCCESS) {
     LOG(ERROR) << "Calling host_statistics failed.";
     return 0;
   }
   return vmstat.free_count * kVMPageSize;
 }
 
 uint64_t GetRealMemoryUsedInBytes() {
   base::ProcessHandle process_handle = base::GetCurrentProcessHandle();
-  scoped_ptr<base::ProcessMetrics> process_metrics(
+  std::unique_ptr<base::ProcessMetrics> process_metrics(
       base::ProcessMetrics::CreateProcessMetrics(process_handle));
   return static_cast<uint64_t>(process_metrics->GetWorkingSetSize());
 }
 
 uint64_t GetDirtyVMBytes() {
   // Iterate over all VM regions and sum their dirty pages.
   unsigned int total_dirty_pages = 0;
   vm_size_t vm_size = 0;
   kern_return_t result;
   for (vm_address_t address = MACH_VM_MIN_ADDRESS;; address += vm_size) {
@@ skipping 24 matching lines @@
                 reinterpret_cast<task_info_t>(&task_vm_info), &count);
   if (result != KERN_SUCCESS) {
     LOG(ERROR) << "Calling task_info failed.";
     return 0;
   }
 
   return static_cast<uint64_t>(task_vm_info.internal);
 }
 
 }  // namespace memory_util