Remove the LowMemoryMargin field trial.

chrome/browser/chromeos/chrome_browser_main_chromeos.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_CHROME_BROWSER_MAIN_CHROMEOS_H_
 #define CHROME_BROWSER_CHROMEOS_CHROME_BROWSER_MAIN_CHROMEOS_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chrome_browser_main_linux.h"
@@ skipping 52 matching lines @@
   virtual void PreProfileInit() OVERRIDE;
   virtual void PostProfileInit() OVERRIDE;
   virtual void PreBrowserStart() OVERRIDE;
   virtual void PostBrowserStart() OVERRIDE;
 
   virtual void PostMainMessageLoopRun() OVERRIDE;
 
   virtual void SetupPlatformFieldTrials() OVERRIDE;
 
  private:
   // Set up field trial for low memory headroom settings.

[Greg Spencer (Chromium), 2013/04/10 18:50:54]

Sorry to stop your CQ, but I just realized that you probably need to remove this
comment too.

[SteveT, 2013/04/10 18:55:23]

Oh shoot. Totally skimmed that. Thanks- removed.

-  void SetupLowMemoryHeadroomFieldTrial();
   void SetupZramFieldTrial();
 
   scoped_ptr<contacts::ContactManager> contact_manager_;
   scoped_ptr<BrightnessObserver> brightness_observer_;
   scoped_ptr<DisplayConfigurationObserver> display_configuration_observer_;
   scoped_ptr<default_app_order::ExternalLoader> app_order_loader_;
   scoped_ptr<SuspendObserver> suspend_observer_;
   scoped_ptr<ResumeObserver> resume_observer_;
   scoped_ptr<ScreenLockObserver> screen_lock_observer_;
   scoped_ptr<ScreensaverController> screensaver_controller_;
@@ skipping 10 matching lines @@
   VersionLoader cros_version_loader_;
   CancelableTaskTracker tracker_;
   bool use_new_network_change_notifier_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainPartsChromeos);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CHROME_BROWSER_MAIN_CHROMEOS_H_