Block NPAPI plugins by default

content/browser/plugin_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.
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/path_service.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
@@ skipping 56 matching lines @@
       }
     }
 #elif defined(OS_MACOSX)
     base::FilePath plugin_dir;
     PathService::Get(base::DIR_MODULE, &plugin_dir);
     plugin_dir = plugin_dir.AppendASCII("plugins");
     // The plugins directory isn't read by default on the Mac, so it needs to be
     // explicitly registered.
     command_line->AppendSwitchPath(switches::kExtraPluginDir, plugin_dir);
 #endif
+    command_line->AppendSwitch(switches::kEnableNpapi);
   }
 
   void SetUpOnMainThread() override {
     base::FilePath path = GetTestFilePath("", "");
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE, base::Bind(&SetUrlRequestMock, path));
   }
 
   static void LoadAndWaitInWindow(Shell* window, const GURL& url) {
     base::string16 expected_title(ASCIIToUTF16("OK"));
@@ skipping 470 matching lines @@
   ResourceDispatcherHostDelegate* old_delegate =
       ResourceDispatcherHostImpl::Get()->delegate();
   ResourceDispatcherHostImpl::Get()->SetDelegate(&test_delegate);
   LoadAndWait(url);
   test_delegate.WaitForPluginRequest();
   ASSERT_TRUE(test_delegate.found_cookie());
   ResourceDispatcherHostImpl::Get()->SetDelegate(old_delegate);
 }
 
 }  // namespace content