Implement RunFileChooser for ExtensionHost, so that file input elements work in

chrome/browser/file_select_helper.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/file_select_helper.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/file_util.h"
@@ skipping 283 matching lines @@
   select_file_types_.reset(
       GetFileTypesFromAcceptType(params.accept_types));
 
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&FileSelectHelper::RunFileChooserOnUIThread, this, params));
 }
 
 void FileSelectHelper::RunFileChooserOnUIThread(
     const content::FileChooserParams& params) {
-  if (!render_view_host_ || !tab_contents_)
+  if (!render_view_host_ || !tab_contents_) {
+    // If the renderer was destroyed before we started, just cancel the
+    // operation.
+    RunFileChooserEnd();
     return;
+  }
 
   if (!select_file_dialog_.get())
     select_file_dialog_ = SelectFileDialog::Create(this);
 
   switch (params.mode) {
     case content::FileChooserParams::Open:
       dialog_type_ = SelectFileDialog::SELECT_OPEN_FILE;
       break;
     case content::FileChooserParams::OpenMultiple:
       dialog_type_ = SelectFileDialog::SELECT_OPEN_MULTI_FILE;
@@ skipping 74 matching lines @@
       DCHECK(content::Source<TabContents>(source).ptr() == tab_contents_);
       tab_contents_ = NULL;
       break;
     }
 
     default:
       NOTREACHED();
   }
 }