Prevent mouse down events in the bookmark bar and download shelf from moving the browser window

chrome/browser/cocoa/download_shelf_view.mm

 // 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 "chrome/browser/cocoa/download_shelf_view.h"
 
 #include "base/scoped_nsobject.h"
 #import "third_party/GTM/AppKit/GTMTheme.h"
 
 @implementation DownloadShelfView
@@ skipping 28 matching lines @@
                             NSGradientDrawsAfterEndingLocation];
   }
 
   // Draw top stroke
   [[self strokeColor] set];
   NSRect borderRect, contentRect;
   NSDivideRect([self bounds], &borderRect, &contentRect, 1, NSMaxYEdge);
   NSRectFillUsingOperation(borderRect, NSCompositeSourceOver);
 }
 
+// Mouse down events on the download shelf should not allow dragging the parent
+// window around.
+- (BOOL)mouseDownCanMoveWindow {
+  return NO;
+}
+
 @end