Cleanup: IWYU for BrowserThread.

chrome/browser/ui/cocoa/dock_icon.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/dock_icon.h"
 
+#include "base/logging.h"
 #include "base/mac/bundle_locations.h"
 #include "base/memory/scoped_nsobject.h"
 #include "content/public/browser/browser_thread.h"
 #include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
 
 using content::BrowserThread;
 
 namespace {
 
 // The fraction of the size of the dock icon that the badge is.
@@ skipping 241 matching lines @@
 
 - (void)setProgress:(float)progress {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   NSDockTile* dockTile = [[NSApplication sharedApplication] dockTile];
   DockTileView* dockTileView = (DockTileView*)([dockTile contentView]);
 
   [dockTileView setProgress:progress];
 }
 
 @end