Remove unneeded JNI registrations.

content/app/android/content_main.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/app/android/content_main.h"
-
 #include "base/at_exit.h"
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/lazy_instance.h"
 #include "content/public/app/content_main.h"
 #include "content/public/app/content_main_delegate.h"
 #include "content/public/app/content_main_runner.h"
 #include "content/public/common/content_switches.h"
 #include "jni/ContentMain_jni.h"
@@ skipping 29 matching lines @@
     g_content_runner.Get()->Initialize(params);
   }
   return g_content_runner.Get()->Run();
 }
 
 void SetContentMainDelegate(ContentMainDelegate* delegate) {
   DCHECK(!g_content_main_delegate.Get().get());
   g_content_main_delegate.Get().reset(delegate);
 }
 
-bool RegisterContentMain(JNIEnv* env) {
-  return RegisterNativesImpl(env);
-}
-
 }  // namespace content