Make `content` target build without unused data members on Linux.

content/renderer/renderer_main_platform_delegate_linux.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/renderer/renderer_main_platform_delegate.h"
 
 #include <errno.h>
 #include <sys/stat.h>
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "content/common/sandbox_linux/sandbox_linux.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/sandbox_init.h"
 
 namespace content {
 
 RendererMainPlatformDelegate::RendererMainPlatformDelegate(
-    const MainFunctionParams& parameters)
-    : parameters_(parameters) {
-}
+    const MainFunctionParams& parameters) {}
 
 RendererMainPlatformDelegate::~RendererMainPlatformDelegate() {
 }
 
 void RendererMainPlatformDelegate::PlatformInitialize() {
 }
 
 void RendererMainPlatformDelegate::PlatformUninitialize() {
 }
 
@@ skipping 26 matching lines @@
     // but we know that under the seccomp-bpf sandbox, this should return EPERM.
     CHECK_EQ(fchmod(-1, 07777), -1);
     CHECK_EQ(errno, EPERM);
   }
 #endif  // __x86_64__
 
   return true;
 }
 
 }  // namespace content