Create base::win::MemoryPressureMonitor class.

content/browser/browser_main_loop.h

Index: content/browser/browser_main_loop.h
diff --git a/content/browser/browser_main_loop.h b/content/browser/browser_main_loop.h
index 0a9e387eef262c50034e9ef9233651f5be02b106..d2499f3ae7561b48e1c706565ffb8ac0feba1774 100644
--- a/content/browser/browser_main_loop.h
+++ b/content/browser/browser_main_loop.h
@@ -22,8 +22,9 @@ class PowerMonitor;
 class SystemMonitor;
 #if defined(OS_CHROMEOS)
 class MemoryPressureMonitorChromeOS;
-#elif defined(OS_MACOSX)
-class MemoryPressureMonitorMac;
+#elif defined(OS_MACOSX) || defined(OS_WIN)
+class MemoryPressureMonitor;
+}  // namespace win
 #endif
 namespace trace_event {
 class TraceMemoryController;
@@ -182,8 +183,8 @@ class CONTENT_EXPORT BrowserMainLoop {
 #endif
 #if defined(OS_CHROMEOS)
   scoped_ptr<base::MemoryPressureMonitorChromeOS> memory_pressure_monitor_;
-#elif defined(OS_MACOSX) && !defined(OS_IOS)
-  scoped_ptr<base::MemoryPressureMonitorMac> memory_pressure_monitor_;
+#elif (defined(OS_MACOSX) && !defined(OS_IOS)) || defined(OS_WIN)
+  scoped_ptr<base::MemoryPressureMonitor> memory_pressure_monitor_;
 #endif
   // The startup task runner is created by CreateStartupTasks()
   scoped_ptr<StartupTaskRunner> startup_task_runner_;