Enable win32k lockdown for ppapi processes.

content/public/browser/content_browser_client.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 "content/public/browser/content_browser_client.h"
 
 #include "base/files/file_path.h"
 #include "base/guid.h"
 #include "build/build_config.h"
 #include "content/public/browser/client_certificate_delegate.h"
@@ skipping 399 matching lines @@
 
 base::string16 ContentBrowserClient::GetAppContainerSidForSandboxType(
     int sandbox_type) const {
   // Embedders should override this method and return different SIDs for each
   // sandbox type. Note: All content level tests will run child processes in the
   // same AppContainer.
   return base::string16(
       L"S-1-15-2-3251537155-1984446955-2931258699-841473695-1938553385-"
       L"924012148-129201922");
 }
-
-bool ContentBrowserClient::IsWin32kLockdownEnabledForMimeType(
-    const std::string& mime_type) const {
-  // TODO(wfh): Enable this by default once Win32k lockdown for PPAPI processes
-  // is enabled by default in Chrome. See crbug.com/523278.
-  return false;
-}
 #endif  // defined(OS_WIN)
 
 std::unique_ptr<base::Value> ContentBrowserClient::GetServiceManifestOverlay(
     const std::string& name) {
   return nullptr;
 }
 
 }  // namespace content