Don't override application/octet-stream MIME type.

content/browser/download/download_browsertest.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.
 
 // This file contains download browser tests that are known to be runnable
 // in a pure content context.  Over time tests should be migrated here.
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/strings/stringprintf.h"
+#include "base/strings/utf_string_conversions.h"
 #include "content/browser/byte_stream.h"
 #include "content/browser/download/download_file_factory.h"
 #include "content/browser/download/download_file_impl.h"
 #include "content/browser/download/download_item_impl.h"
 #include "content/browser/download/download_manager_impl.h"
 #include "content/browser/download/download_resource_handler.h"
+#include "content/browser/plugin_service_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/power_save_blocker.h"
 #include "content/public/common/content_switches.h"
+#include "content/public/common/webplugininfo.h"
 #include "content/public/test/download_test_observer.h"
 #include "content/public/test/test_file_error_injector.h"
 #include "content/public/test/test_utils.h"
 #include "content/shell/shell.h"
 #include "content/shell/shell_browser_context.h"
 #include "content/shell/shell_download_manager_delegate.h"
 #include "content/test/content_browser_test.h"
 #include "content/test/content_browser_test_utils.h"
 #include "content/test/net/url_request_mock_http_job.h"
 #include "content/test/net/url_request_slow_download_job.h"
@@ skipping 740 matching lines @@
   size_t file_size1 = URLRequestSlowDownloadJob::kFirstDownloadSize +
                       URLRequestSlowDownloadJob::kSecondDownloadSize;
   std::string expected_contents(file_size1, '*');
   ASSERT_TRUE(VerifyFile(file1, expected_contents, file_size1));
 
   base::FilePath file2(download2->GetTargetFilePath());
   ASSERT_TRUE(base::ContentsEqual(
       file2, GetTestFilePath("download", "download-test.lib")));
 }
 
+#if defined(ENABLE_PLUGINS)
+// Content served with a MIME type of application/octet-stream should be
+// downloaded even when a plugin can be found that handles the file type.
+IN_PROC_BROWSER_TEST_F(DownloadContentTest, DownloadOctetStream) {
+  const base::FilePath::CharType kTestFilePath[] =
+      FILE_PATH_LITERAL("octet-stream.abc");
+  const char kTestPluginName[] = "TestPlugin";
+  const char kTestMimeType[] = "application/x-test-mime-type";
+  const char kTestFileType[] = "abc";
+
+  WebPluginInfo plugin_info;
+  plugin_info.name = base::ASCIIToUTF16(kTestPluginName);
+  plugin_info.mime_types.push_back(
+      WebPluginMimeType(kTestMimeType, kTestFileType, ""));
+  PluginServiceImpl::GetInstance()->RegisterInternalPlugin(plugin_info, false);
+
+  // The following is served with a Content-Type of application/octet-stream.
+  GURL url(URLRequestMockHTTPJob::GetMockUrl(base::FilePath(kTestFilePath)));
+  DownloadAndWait(shell(), url, DownloadItem::COMPLETE);
+}
+#endif
+
 // Try to cancel just before we release the download file, by delaying final
 // rename callback.
 IN_PROC_BROWSER_TEST_F(DownloadContentTest, CancelAtFinalRename) {
   // Setup new factory.
   DownloadFileWithDelayFactory* file_factory =
       new DownloadFileWithDelayFactory();
   DownloadManagerImpl* download_manager(DownloadManagerForShell(shell()));
   download_manager->SetDownloadFileFactoryForTesting(
       scoped_ptr<DownloadFileFactory>(file_factory).Pass());
 
@@ skipping 775 matching lines @@
   // Start the second download and wait until it's done. The test server is
   // single threaded. The response to this download request should follow the
   // response to the previous resumption request.
   GURL url2(test_server()->GetURL("rangereset?size=100&rst_limit=0&token=x"));
   DownloadAndWait(shell(), url2, DownloadItem::COMPLETE);
 
   EXPECT_TRUE(EnsureNoPendingDownloads());
 }
 
 }  // namespace content