[Mac] Make entering system fullscreen from presentation mode possible.

chrome/browser/ui/cocoa/browser_window_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/browser_window_controller.h"
 
 #include <cmath>
 #include <numeric>
 
 #include "base/command_line.h"
@@ skipping 2039 matching lines @@
       [self showFullscreenExitBubbleIfNecessary];
     } else {
       // If not in fullscreen mode, trigger the Lion fullscreen mode machinery.
       // Presentation mode will automatically be enabled in
       // |-windowWillEnterFullScreen:|.
       NSWindow* window = [self window];
       if ([window isKindOfClass:[FramedBrowserWindow class]])
         [static_cast<FramedBrowserWindow*>(window) toggleSystemFullScreen];
     }
   } else {
-    // The user is currently in presentation mode and is now exiting it, which
-    // also exits fullscreen using the Lion machinery.
-    NSWindow* window = [self window];
-    if ([window isKindOfClass:[FramedBrowserWindow class]])
-      [static_cast<FramedBrowserWindow*>(window) toggleSystemFullScreen];
+    // Exiting presentation mode does not exit system fullscreen; it merely
+    // switches from presentation mode to normal fullscreen.
+    [self setPresentationModeInternal:NO forceDropdown:NO];
   }
 }
 
 - (void)enterPresentationModeForURL:(const GURL&)url
                          bubbleType:(FullscreenExitBubbleType)bubbleType {
   [self setPresentationMode:YES url:url bubbleType:bubbleType];
 }
 
 - (void)exitPresentationMode {
   // url: and bubbleType: are ignored when leaving presentation mode.
- [self setPresentationMode:NO url:GURL() bubbleType:FEB_TYPE_NONE];
+  [self setPresentationMode:NO url:GURL() bubbleType:FEB_TYPE_NONE];
 }
 
 - (BOOL)inPresentationMode {
   return presentationModeController_.get() &&
       [presentationModeController_ inPresentationMode];
 }
 
 - (void)resizeFullscreenWindow {
   DCHECK([self isFullscreen]);
   if (![self isFullscreen])
@@ skipping 118 matching lines @@
 
 - (BOOL)supportsBookmarkBar {
   return [self supportsWindowFeature:Browser::FEATURE_BOOKMARKBAR];
 }
 
 - (BOOL)isTabbedWindow {
   return browser_->is_type_tabbed();
 }
 
 @end  // @implementation BrowserWindowController(WindowType)