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 35 matching lines @@
 }
 
 class PluginTest : public ContentBrowserTest {
  protected:
   PluginTest() {}
 
   virtual void SetUpCommandLine(CommandLine* command_line) override {
     // Some NPAPI tests schedule garbage collection to force object tear-down.
     command_line->AppendSwitchASCII(switches::kJavaScriptFlags, "--expose_gc");
 
+#if defined(OS_WIN) || defined(OS_MACOSX)
+    command_line->AppendSwitch(switches::kEnableNpapi);
+#endif
 #if defined(OS_WIN)
     const testing::TestInfo* const test_info =
         testing::UnitTest::GetInstance()->current_test_info();
     if (strcmp(test_info->name(), "MediaPlayerNew") == 0) {
       // The installer adds our process names to the registry key below.  Since
       // the installer might not have run on this machine, add it manually.
       base::win::RegKey regkey;
       if (regkey.Open(HKEY_LOCAL_MACHINE,
                       L"Software\\Microsoft\\MediaPlayer\\ShimInclusionList",
                       KEY_WRITE) == ERROR_SUCCESS) {
@@ skipping 492 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