Added memory pressure monitor for linux.

base/memory/memory_pressure_monitor_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 "base/memory/memory_pressure_monitor_win.h"
+#include "base/memory/memory_pressure_monitor.h"
 
 #include "base/basictypes.h"
 #include "base/memory/memory_pressure_listener.h"
 #include "base/message_loop/message_loop.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
-namespace win {
 
 namespace {
 
 struct PressureSettings {
   int phys_left_mb;
   MemoryPressureListener::MemoryPressureLevel level;
 };
 
 }  // namespace
 
@@ skipping 262 matching lines @@
 
   // Going down to no pressure should not produce an notification.
   monitor.SetNone();
   monitor.CheckMemoryPressure();
   message_loop_.RunUntilIdle();
   EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE,
             monitor.GetCurrentPressureLevel());
   testing::Mock::VerifyAndClearExpectations(&monitor);
 }
 
-}  // namespace win
 }  // namespace base