Fix client-side phishing detection test flakiness and ChromeOS failure.

content/test/render_test_utils.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/test/render_test_utils.h"
+
+namespace content {
+
+WebKit::WebSandboxSupport*
+RendererWebKitPlatformSupportImplNoSandbox::sandboxSupport() {
+  return NULL;
+}
+
+RenderThreadImplNoSandbox::RenderThreadImplNoSandbox(
+    const std::string& channel_name)
+    : RenderThreadImpl(channel_name) {}
+
+RenderThreadImplNoSandbox::~RenderThreadImplNoSandbox() {}
+
+RendererWebKitPlatformSupportImpl*
+RenderThreadImplNoSandbox::CreateWebKitPlatformSupport() {
+  return new RendererWebKitPlatformSupportImplNoSandbox();
+}
+
+}  // namespace content