Added memory pressure monitor for linux.

base/memory/memory_pressure_monitor_chromeos_unittest.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 "base/memory/memory_pressure_monitor_chromeos.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/gtest/include/gtest/gtest.h"
 
 namespace base {
-namespace chromeos {
 
 namespace {
 
 // True if the memory notifier got called.
 // Do not read/modify value directly.
 bool on_memory_pressure_called = false;
 
 // If the memory notifier got called, this is the memory pressure reported.
 MemoryPressureListener::MemoryPressureLevel on_memory_pressure_level =
     MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE;
@@ skipping 131 matching lines @@
     if (WasOnMemoryPressureCalled()) {
       EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
                 on_memory_pressure_level);
       break;
     }
   }
   // We should have needed exactly the same amount of checks as before.
   EXPECT_EQ(j, i);
 }
 
-}  // namespace chromeos
 }  // namespace base