Re-land: add support for blocking out-of-date plug-ins on Linux....

chrome/test/plugin/plugin_test.cpp

 // Copyright (c) 2010 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.
 
 // Tests for the top plugins to catch regressions in our plugin host code, as
 // well as in the out of process code.  Currently this tests:
 //  Flash
 //  Real
 //  QuickTime
 //  Windows Media Player
@@ skipping 106 matching lines @@
     GURL url = GetTestUrl("done", mock_http);
     scoped_refptr<TabProxy> tab(GetActiveTab());
 
     const std::string result =
         WaitUntilCookieNonEmpty(tab, url, kTestCompleteCookie, wait_time);
     ASSERT_EQ(kTestCompleteSuccess, result);
   }
 };
 
 // http://crbug.com/68303
-#if defined(OS_MACOSX)
+#if defined(OS_MACOSX) || defined(OS_LINUX)
 TEST_F(PluginTest, DISABLED_Flash) {
 #else
 TEST_F(PluginTest, Flash) {
 #endif
   // Note: This does not work with the npwrapper on 64-bit Linux. Install the
   // native 64-bit Flash to run the test.
   // TODO(thestig) Update this list if we decide to only test against internal
   // Flash plugin in the future?
   std::string kFlashQuery =
 #if defined(OS_WIN)
@@ skipping 223 matching lines @@
 TEST_F(PluginInstallerDownloadTest, PluginInstallerDownloadPathTest) {
   MessageLoop loop(MessageLoop::TYPE_IO);
   Start();
   loop.Run();
 
   EXPECT_TRUE(success());
   EXPECT_TRUE(initial_download_path().BaseName().value() ==
               final_download_path().BaseName().value());
 }
 #endif  // defined(OS_WIN)