Migrate ChromeOS to base::MemoryPressureMonitor

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index 440925423d8b91535d5f3e3bb73ff9d05a6fc95f..313561c7e6ccbf975373a013f3ddbce92c49225c 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -102,11 +102,6 @@
 #include "ui/base/l10n/l10n_util_win.h"
 #endif
 
-#if defined(OS_CHROMEOS)
-#include "base/chromeos/memory_pressure_observer_chromeos.h"
-#include "chromeos/chromeos_switches.h"
-#endif
-
 #if defined(USE_GLIB)
 #include <glib-object.h>
 #endif
@@ -588,13 +583,6 @@ int BrowserMainLoop::PreCreateThreads() {
     result_code_ = parts_->PreCreateThreads();
   }
 
-#if defined(OS_CHROMEOS)
-  if (chromeos::switches::MemoryPressureHandlingEnabled()) {
-    memory_pressure_observer_.reset(new base::MemoryPressureObserverChromeOS(
-        chromeos::switches::GetMemoryPressureThresholds()));
-  }
-#endif
-
 #if defined(ENABLE_PLUGINS)
   // Prior to any processing happening on the io thread, we create the
   // plugin service as it is predominantly used from the io thread,
@@ -851,10 +839,6 @@ void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
     resource_dispatcher_host_.get()->Shutdown();
   }
 
-#if defined(OS_CHROMEOS)
-  memory_pressure_observer_.reset();
-#endif
-
 #if defined(OS_MACOSX)
   BrowserCompositorMac::DisableRecyclingForShutdown();
 #endif