Android: Remove unneeded RegisterNatives() calls

components/web_contents_delegate_android/web_contents_delegate_android.h

 // 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.
 
 #ifndef COMPONENTS_WEB_CONTENTS_DELEGATE_ANDROID_WEB_CONTENTS_DELEGATE_ANDROID_H_
 #define COMPONENTS_WEB_CONTENTS_DELEGATE_ANDROID_WEB_CONTENTS_DELEGATE_ANDROID_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 110 matching lines @@
 
  private:
   // We depend on the java side user of WebContentDelegateAndroid to hold a
   // strong reference to that object as long as they want to receive callbacks
   // on it. Using a weak ref here allows it to be correctly GCed.
   JavaObjectWeakGlobalRef weak_java_delegate_;
 
   std::unique_ptr<ValidationMessageBubbleAndroid> validation_message_bubble_;
 };
 
-bool RegisterWebContentsDelegateAndroid(JNIEnv* env);
-
 }  // namespace web_contents_delegate_android
 
 #endif  // COMPONENTS_WEB_CONTENTS_DELEGATE_ANDROID_WEB_CONTENTS_DELEGATE_ANDROID_H_