mac: Fix a logic error in presentation_mode_controller.

chrome/browser/ui/cocoa/presentation_mode_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/presentation_mode_controller.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #import "base/mac/mac_util.h"
@@ skipping 162 matching lines @@
 
 // Stops any running animations, removes tracking areas, etc.
 - (void)cleanup;
 
 // Shows and hides the UI associated with this window being active (having main
 // status).  This includes hiding the menu bar.  These functions are called when
 // the window gains or loses main status as well as in |-cleanup|.
 - (void)showActiveWindowUI;
 - (void)hideActiveWindowUI;
 
-// In Immersive Fullscreen, the menubar is visible iff. toolbarFraction_ >=
-// 1.0.
+// Whether the menu bar should be shown in immersive fullscreen for the screen
+// that contains the window.
 - (BOOL)shouldShowMenubarInImmersiveFullscreen;
 
 @end
 
 
 @implementation PresentationModeController
 
 @synthesize inPresentationMode = inPresentationMode_;
 @synthesize slidingStyle = slidingStyle_;
 @synthesize toolbarFraction = toolbarFraction_;
@@ skipping 543 matching lines @@
   // TODO(rohitrao): Insert the Exit Fullscreen button.  http://crbug.com/35956
 }
 
 - (void)hideActiveWindowUI {
   [self updateMenuBarAndDockVisibility];
 
   // TODO(rohitrao): Remove the Exit Fullscreen button.  http://crbug.com/35956
 }
 
 - (BOOL)shouldShowMenubarInImmersiveFullscreen {
-  return toolbarFraction_ >= 1.0;
+  return [self doesScreenHaveMenuBar] && toolbarFraction_ > 0.99;
 }
 
 @end