Remove bad CallJavascriptFunctionUnsafe call from PrintPreviewUI

chrome/browser/printing/background_printing_manager.cc

 // 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.
 
 #include "chrome/browser/printing/background_printing_manager.h"
 
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
@@ skipping 95 matching lines @@
     if (preview_contents->GetBrowserContext() == browser_context) {
       preview_contents_to_delete.push_back(preview_contents);
     }
   }
 
   for (size_t i = 0; i < preview_contents_to_delete.size(); i++) {
     DeletePreviewContents(preview_contents_to_delete[i]);
   }
 }
 
+void BackgroundPrintingManager::OnPrintRequestCancelled(
+    WebContents* preview_contents) {
+  DeletePreviewContents(preview_contents);
+}
+
 void BackgroundPrintingManager::DeletePreviewContents(
     WebContents* preview_contents) {
   auto i = printing_contents_map_.find(preview_contents);
   if (i == printing_contents_map_.end()) {
     // Everyone is racing to be the first to delete the |preview_contents|. If
     // this case is hit, someone else won the race, so there is no need to
     // continue. <http://crbug.com/100806>
     return;
   }
 
@@ skipping 15 matching lines @@
 
   return result;
 }
 
 bool BackgroundPrintingManager::HasPrintPreviewDialog(
     WebContents* preview_dialog) {
   return base::ContainsKey(printing_contents_map_, preview_dialog);
 }
 
 }  // namespace printing