Fix the URL status bubble overlapping the Mac download shelf

chrome/browser/cocoa/download_shelf_controller.h

 // Copyright (c) 2009 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 <Cocoa/Cocoa.h>
 
 #include "base/scoped_nsobject.h"
 #include "base/scoped_ptr.h"
 
 class BaseDownloadItemModel;
@@ skipping 10 matching lines @@
   IBOutlet NSTextView* showAllDownloadsLink_;
 
   // Currently these two are always the same, but they mean slightly different
   // things. |contentAreaHasOffset_| is an implementation detail of the download
   // shelf visibility.
   BOOL contentAreaHasOffset_;
   BOOL barIsVisible_;
 
   scoped_ptr<DownloadShelf> bridge_;
   NSView* contentArea_;
-  int shelfHeight_;
+  float shelfHeight_;
 
   // The download items we have added to our shelf.
   scoped_nsobject<NSMutableArray> downloadItemControllers_;
 };
 
 - (id)initWithBrowser:(Browser*)browser contentArea:(NSView*)content;
 
 - (DownloadShelf*)bridge;
 - (BOOL)isVisible;
 
 - (IBAction)show:(id)sender;
+
+// Run when the user clicks the close button on the right side of the shelf.
 - (IBAction)hide:(id)sender;
 
 - (void)addDownloadItem:(BaseDownloadItemModel*)model;
 
 // Resizes the download shelf based on the state of the content area.
 - (void)resizeDownloadShelf;
 
 // Remove a download, possibly via clearing browser data.
 - (void)remove:(DownloadItemController*)download;
 
 // Notification that we are closing and should release our downloads.
 - (void)exiting;
 
+// Return the height of the download shelf.
+- (float)height;
+
 @end