Fix clang build

mojo/services/native_viewport/android/mojo_viewport.h

 // Copyright 2013 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.
 
 #ifndef MOJO_SERVICES_NATIVE_VIEWPORT_ANDROID_MOJO_VIEWPORT_H_
 #define MOJO_SERVICES_NATIVE_VIEWPORT_ANDROID_MOJO_VIEWPORT_H_
 
 #include "base/android/jni_helper.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "mojo/services/native_viewport/native_viewport_android.h"
 #include "ui/gl/gl_surface_egl.h"
 
 struct ANativeWindow;
 
 namespace mojo {
 namespace services {
 
 struct MojoViewportInit {
+  MojoViewportInit();
+  ~MojoViewportInit();
+
   scoped_refptr<base::SingleThreadTaskRunner> ui_runner;
   base::WeakPtr<NativeViewportAndroid> native_viewport;
 };
 
 class MojoViewport {
  public:
   static bool Register(JNIEnv* env);
 
   static void CreateForActivity(
     jobject activity, MojoViewportInit* init);
@@ skipping 15 matching lines @@
   scoped_refptr<gfx::GLSurface> surface_;
   scoped_refptr<gfx::GLContext> gl_context_;
 
   DISALLOW_COPY_AND_ASSIGN(MojoViewport);
 };
 
 }  // namespace services
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_NATIVE_VIEWPORT_ANDROID_MOJO_VIEWPORT_H_