Move MemoryPressureObserverChromeOS instantiation from Chrome to Content

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 032b94b9092a0a5ba0f563f47fab0d593a5aca45..134e735fa787c3620328c043cc4843afaf659dd7 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.h
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.h
@@ -11,10 +11,6 @@
 #include "chrome/browser/chromeos/external_metrics.h"
 #include "chrome/browser/chromeos/version_loader.h"
 
-namespace base {
-class MemoryPressureObserverChromeOS;
-}
-
 namespace content {
 class PowerSaveBlocker;
 }
@@ -90,8 +86,6 @@ class ChromeBrowserMainPartsChromeos : public ChromeBrowserMainPartsLinux {
 
   scoped_refptr<chromeos::ExternalMetrics> external_metrics_;
 
-  scoped_ptr<base::MemoryPressureObserverChromeOS> memory_pressure_observer_;
-
   bool use_new_network_change_notifier_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainPartsChromeos);