content: Use base::MessageLoop.

BUG=236029
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Review URL: https://chromiumcodereview.appspot.com/14335017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@198316 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/content/browser/download/download_manager_impl.cc b/content/browser/download/download_manager_impl.cc
index f48d46f..3fa90438 100644
--- a/content/browser/download/download_manager_impl.cc
+++ b/content/browser/download/download_manager_impl.cc
@@ -164,7 +164,7 @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   *result = (DownloadFile::GetNumberOfDownloadFiles() == 0);
   BrowserThread::PostTask(
-        BrowserThread::UI, FROM_HERE, MessageLoop::QuitClosure());
+      BrowserThread::UI, FROM_HERE, base::MessageLoop::QuitClosure());
 }
 
 class DownloadItemFactoryImpl : public DownloadItemFactory {