Consolidate code monitoring low memory kills and OOM kills to MemoryKillsMonitor on ChromeOS.

chrome/browser/chromeos/chrome_browser_main_chromeos.h

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.h
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.h b/chrome/browser/chromeos/chrome_browser_main_chromeos.h
index 0847ae7f97e8e5d34fad49740a1c8003fe489714..db8b8c968cf629b0966ec1952ba5a29b98bc2174 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.h
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.h
@@ -11,6 +11,7 @@
 #include "base/task/cancelable_task_tracker.h"
 #include "chrome/browser/chrome_browser_main_linux.h"
 #include "chrome/browser/chromeos/external_metrics.h"
+#include "chrome/browser/memory/memory_kills_monitor.h"
 #include "chromeos/system/version_loader.h"
 
 namespace session_manager {
@@ -99,6 +100,8 @@ class ChromeBrowserMainPartsChromeos : public ChromeBrowserMainPartsLinux {
   std::unique_ptr<LowDiskNotification> low_disk_notification_;
   std::unique_ptr<ArcKioskAppManager> arc_kiosk_app_manager_;
 
+  std::unique_ptr<memory::MemoryKillsMonitor::Handle> memory_kills_monitor_;
+
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainPartsChromeos);
 };