Fix free memory calculation.

components/memory_pressure/direct_memory_pressure_calculator_win_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_win.h"
 
 #include "base/logging.h"
 #include "base/process/process_metrics.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 41 matching lines @@
     if (large_memory)
       return total_mb * 2;
     return total_mb / 2;
   }
 
   // Sets up the memory status to reflect the provided absolute memory left.
   void SetMemoryFree(int phys_left_mb) {
     // |total| is set in the constructor and not modified.
 
     // Set the amount of free memory.
-    mem_info_.free = phys_left_mb * kKBperMB;
-    DCHECK_LT(mem_info_.free, mem_info_.total);
+    mem_info_.available = phys_left_mb * kKBperMB;
+    DCHECK_LT(mem_info_.available, mem_info_.total);
   }
 
   void SetNone() { SetMemoryFree(moderate_threshold_mb() + 1); }
 
   void SetModerate() { SetMemoryFree(moderate_threshold_mb() - 1); }
 
   void SetCritical() { SetMemoryFree(critical_threshold_mb() - 1); }
 
  private:
   bool GetSystemMemoryInfo(base::SystemMemoryInfoKB* mem_info) const override {
@@ skipping 98 matching lines @@
 
   EXPECT_EQ(kModerateMb, calc.moderate_threshold_mb());
   EXPECT_EQ(kCriticalMb, calc.critical_threshold_mb());
 
   ASSERT_NO_FATAL_FAILURE(CalculateCurrentPressureLevelTest(&calc));
 }
 
 #endif  // defined(MEMORY_PRESSURE_IS_POLLING)
 
 }  // namespace memory_pressure