Rename OS-specific MemoryPressureMonitor implementations.

chrome/browser/chromeos/memory/oom_priority_manager.cc

 // Copyright (c) 2012 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 "chrome/browser/chromeos/memory/oom_priority_manager.h"
 
 #include <algorithm>
 #include <set>
 #include <vector>
 
@@ skipping 494 matching lines @@
       if (!low_memory_observer_) {
         // Coming here we know that a renderer was just killed and memory should
         // come back into the pool. However - the memory pressure observer did
         // not yet update its status and therefore we ask it to redo the
         // measurement, calling us again if we have to release more.
         // Note: We do not only accelerate the discarding speed by doing another
         // check in short succession - we also accelerate it because the timer
         // driven MemoryPressureMonitor will continue to produce timed events
         // on top. So the longer the cleanup phase takes, the more tabs will
         // get discarded in parallel.
-        base::MemoryPressureMonitorChromeOS* monitor =
-            static_cast<base::MemoryPressureMonitorChromeOS*>(
-                base::MemoryPressureMonitor::Get());
+        base::chromeos::MemoryPressureMonitor* monitor =
+            base::chromeos::MemoryPressureMonitor::Get();
         if (monitor)
           monitor->ScheduleEarlyCheck();
       }
       break;
     }
     case content::NOTIFICATION_RENDER_WIDGET_VISIBILITY_CHANGED: {
       bool visible = *content::Details<bool>(details).ptr();
       if (visible) {
         content::RenderProcessHost* render_host =
             content::Source<content::RenderWidgetHost>(source).ptr()->
@@ skipping 172 matching lines @@
   // For the moment we only do something when we reach a critical state.
   if (memory_pressure_level ==
       base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL) {
     LogMemoryAndDiscardTab();
   }
   // TODO(skuhne): If more memory pressure levels are introduced, we might
   // consider to call PurgeBrowserMemory() before CRITICAL is reached.
 }
 
 }  // namespace chromeos