Return unique_ptrs from base::ProcessMetrics.

components/memory_pressure/direct_memory_pressure_calculator_linux.cc

 // Copyright 2016 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 "components/memory_pressure/direct_memory_pressure_calculator_linux.h"
 
 #include "base/process/process_metrics.h"
 #include "base/sys_info.h"
 
 namespace memory_pressure {
 
 namespace {
 
-static const int kKiBperMiB = 1024;
+const int kKiBperMiB = 1024;
 
 int GetAvailableSystemMemoryMiB(const base::SystemMemoryInfoKB* mem_info) {
   // How much system memory is actively available for use right now, in MBs.
   return (mem_info->available
               ? mem_info->available
               : (mem_info->free + mem_info->buffers + mem_info->cached)) /
          kKiBperMiB;
 }
 
 }  // namespace
@@ skipping 46 matching lines @@
   if (!GetSystemMemoryInfo(&mem_info))
     return;
 
   moderate_threshold_mb_ =
       mem_info.total * (100 - kDefaultModerateThresholdPc) / 100 / kKiBperMiB;
   critical_threshold_mb_ =
       mem_info.total * (100 - kDefaultCriticalThresholdPc) / 100 / kKiBperMiB;
 }
 
 }  // namespace memory_pressure