Return unique_ptrs from base::ProcessMetrics.

components/memory_pressure/direct_memory_pressure_calculator_linux_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 "components/memory_pressure/direct_memory_pressure_calculator_linux.h"
 
+#include "base/process/process_metrics.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace memory_pressure {
 
 namespace {
 
-static const int kKBperMB = 1024;
-static const int kTotalMemoryInMB = 4096;
+const int kKBperMB = 1024;
+const int kTotalMemoryInMB = 4096;
 
 }  // namespace
 
 // This is out of the anonymous namespace space because it is a friend of
 // DirectMemoryPressureCalculator.
 class TestDirectMemoryPressureCalculator
     : public DirectMemoryPressureCalculator {
  public:
-  explicit TestDirectMemoryPressureCalculator()
+  TestDirectMemoryPressureCalculator()
       : DirectMemoryPressureCalculator(20, 10) {
     // The values passed to the MemoryPressureCalculator constructor are dummy
     // values that are immediately overwritten by InferTresholds.
 
     // Simulate 4GB of RAM.
     mem_info_.total = kTotalMemoryInMB * kKBperMB;
 
     // Run InferThresholds using the test fixture's GetSystemMemoryStatus.
     InferThresholds();
   }
@@ skipping 107 matching lines @@
 
   TestDirectMemoryPressureCalculator calc(kSystemMb, kModerateMb, kCriticalMb);
 
   EXPECT_EQ(kModerateMb, calc.moderate_threshold_mb());
   EXPECT_EQ(kCriticalMb, calc.critical_threshold_mb());
 
   ASSERT_NO_FATAL_FAILURE(CalculateCurrentPressureLevelTest(&calc));
 }
 
 }  // namespace memory_pressure