Linux: work around the fact that the download dialog has not been ported....

chrome/browser/download/download_request_manager.cc

 // Copyright (c) 2006-2008 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/download/download_request_manager.h"
 
 #include "base/message_loop.h"
 #include "base/thread.h"
 #include "chrome/browser/download/download_request_dialog_delegate.h"
 #include "chrome/browser/tab_contents/navigation_controller.h"
@@ skipping 48 matching lines @@
 }
 
 void DownloadRequestManager::TabDownloadState::PromptUserForDownload(
     TabContents* tab,
     DownloadRequestManager::Callback* callback) {
   callbacks_.push_back(callback);
 
   if (is_showing_prompt())
     return;  // Already showing prompt.
 
-  if (DownloadRequestManager::delegate_)
+  if (DownloadRequestManager::delegate_) {
     NotifyCallbacks(DownloadRequestManager::delegate_->ShouldAllowDownload());
-  else
+  } else {
     dialog_delegate_ = DownloadRequestDialogDelegate::Create(tab, this);
+    // TODO(estade): the dialog delegate isn't yet implemented on linux. Just
+    // assume we shouldn't allow the download.
+    if (dialog_delegate_ == NULL)
+      NotifyCallbacks(false);
+  }
 }
 
 void DownloadRequestManager::TabDownloadState::Cancel() {
   NotifyCallbacks(false);
 }
 
 void DownloadRequestManager::TabDownloadState::Accept() {
   NotifyCallbacks(true);
 }
 
@@ skipping 213 matching lines @@
 
 void DownloadRequestManager::Remove(TabDownloadState* state) {
   DCHECK(state_map_.find(state->controller()) != state_map_.end());
   state_map_.erase(state->controller());
   delete state;
 }
 
 // static
 DownloadRequestManager::TestingDelegate* DownloadRequestManager::delegate_ =
     NULL;