Fix classes that have too many virtuals for inline constructors.

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 "content/public/browser/client_certificate_delegate.h"
 #include "content/public/common/sandbox_type.h"
 #include "media/base/cdm_factory.h"
 #include "storage/browser/quota/quota_manager.h"
 #include "ui/gfx/image/image_skia.h"
 #include "url/gurl.h"
 
 namespace content {
 
+ContentBrowserClient::ContentBrowserClient() = default;
+
 BrowserMainParts* ContentBrowserClient::CreateBrowserMainParts(
     const MainFunctionParams& parameters) {
   return nullptr;
 }
 
 void ContentBrowserClient::PostAfterStartupTask(
     const tracked_objects::Location& from_here,
     const scoped_refptr<base::TaskRunner>& task_runner,
     const base::Closure& task) {
   task_runner->PostTask(from_here, task);
@@ skipping 388 matching lines @@
 #if defined(VIDEO_HOLE)
 ExternalVideoSurfaceContainer*
 ContentBrowserClient::OverrideCreateExternalVideoSurfaceContainer(
     WebContents* web_contents) {
   NOTREACHED() << "Hole-punching is not supported. See crbug.com/469348.";
   return nullptr;
 }
 #endif
 
 }  // namespace content