Mac: fix fullscreen floating bar in popup windows.

chrome/browser/cocoa/browser_window_controller.h

 // Copyright (c) 2010 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_COCOA_BROWSER_WINDOW_CONTROLLER_H_
 #define CHROME_BROWSER_COCOA_BROWSER_WINDOW_CONTROLLER_H_
 
 // A class acting as the Objective-C controller for the Browser
 // object. Handles interactions between Cocoa and the cross-platform
 // code. Each window has a single toolbar and, by virtue of being a
@@ skipping 82 matching lines @@
   // The raw accumulated zoom value and the actual zoom increments made for an
   // an in-progress pinch gesture.
   CGFloat totalMagnifyGestureAmount_;
   NSInteger currentZoomStepDelta_;
 
   // The view which shows the incognito badge (NULL if not an incognito window).
   // Needed to access the view to move it to/from the fullscreen window.
   scoped_nsobject<IncognitoImageView> incognitoBadge_;
 
   // Lazily created view which draws the background for the floating set of bars
-  // in fullscreen mode.
+  // in fullscreen mode (for window types having a floating bar; it remains nil
+  // for those which don't).
   scoped_nsobject<NSView> floatingBarBackingView_;
 
   // Tracks whether the floating bar is above or below the bookmark bar, in
   // terms of z-order.
   BOOL floatingBarAboveBookmarkBar_;
 
   // The proportion of the floating bar which is shown (in fullscreen mode).
   CGFloat floatingBarShownFraction_;
 
   // Various UI elements/events may want to ensure that the floating bar is
@@ skipping 236 matching lines @@
 - (NSPoint)topLeftForBubble;
 
 // Resets any saved state about window growth (due to showing the bookmark bar
 // or the download shelf), so that future shrinking will occur from the bottom.
 - (void)resetWindowGrowthState;
 
 @end  // @interface BrowserWindowController(TestingAPI)
 
 
 #endif  // CHROME_BROWSER_COCOA_BROWSER_WINDOW_CONTROLLER_H_