Mac: Always layout the Download Shelf, even if it has zero height.

chrome/browser/ui/cocoa/browser_window_controller_private.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_private.h"
 
 #include <cmath>
 
 #import "base/auto_reset.h"
 #include "base/command_line.h"
@@ skipping 899 matching lines @@
   if (!NSIsEmptyRect(output.bookmarkFrame))
     [bookmarkBarController_ layoutToFrame:output.bookmarkFrame];
 
   // The info bar is never hidden. Sometimes it has zero effective height.
   [[infoBarContainerController_ view] setFrame:output.infoBarFrame];
   [infoBarContainerController_
       setMaxTopArrowHeight:output.infoBarMaxTopArrowHeight];
   [infoBarContainerController_
       setInfobarArrowX:[self locationBarBridge]->GetPageInfoBubblePoint().x];
 
-  if (!NSIsEmptyRect(output.downloadShelfFrame))
-    [[downloadShelfController_ view] setFrame:output.downloadShelfFrame];
+  [[downloadShelfController_ view] setFrame:output.downloadShelfFrame];
 
   [self layoutTabContentArea:output.contentAreaFrame];
 
   if (!NSIsEmptyRect(output.fullscreenBackingBarFrame)) {
     [floatingBarBackingView_ setFrame:output.fullscreenBackingBarFrame];
     [fullscreenToolbarController_
         updateToolbarFrame:output.fullscreenBackingBarFrame];
   }
 
   [findBarCocoaController_
@@ skipping 246 matching lines @@
   if (fullscreenLowPowerCoordinator_)
     fullscreenLowPowerCoordinator_->SetHasActiveSheet(false);
 }
 
 - (void)childWindowsDidChange {
   if (fullscreenLowPowerCoordinator_)
     fullscreenLowPowerCoordinator_->ChildWindowsChanged();
 }
 
 @end  // @implementation BrowserWindowController(Private)