DevTools: Introduce Page.getManifest remote debugging protocol method.

content/renderer/manifest/manifest_debug_info.cc

 // Copyright 2016 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/gpu/content_gpu_client.h"
+#include "content/renderer/manifest/manifest_debug_info.h"
 
 namespace content {
 
-gpu::SyncPointManager* ContentGpuClient::GetSyncPointManager() {
-  return nullptr;
-}
+ManifestDebugInfo::ManifestDebugInfo() = default;
 
-}  // namespace content
+ManifestDebugInfo::~ManifestDebugInfo() = default;
+
+} // namespace content