Android JNI gen: Don't emit code for empty RegisterNatives()

chromecast/browser/android/cast_window_android.h

 // Copyright 2014 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 CHROMECAST_BROWSER_ANDROID_CAST_WINDOW_ANDROID_H_
 #define CHROMECAST_BROWSER_ANDROID_CAST_WINDOW_ANDROID_H_
 
 #include <jni.h>
 #include <stdint.h>
 
@@ skipping 36 matching lines @@
 
   ~CastWindowAndroid() override;
 
   void LoadURL(const GURL& url);
   // Calls RVH::ClosePage() and waits for acknowledgement before closing/
   // deleting the window.
   void Close();
   // Destroys this window immediately.
   void Destroy();
 
-  // Registers the JNI methods for CastWindowAndroid.
-  static bool RegisterJni(JNIEnv* env);
-
   // content::WebContentsDelegate implementation:
   void AddNewContents(content::WebContents* source,
                       content::WebContents* new_contents,
                       WindowOpenDisposition disposition,
                       const gfx::Rect& initial_rect,
                       bool user_gesture,
                       bool* was_blocked) override;
   void CloseContents(content::WebContents* source) override;
   bool CanOverscrollContent() const override;
   bool AddMessageToConsole(content::WebContents* source,
@@ skipping 17 matching lines @@
 
   base::WeakPtrFactory<CastWindowAndroid> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CastWindowAndroid);
 };
 
 }  // namespace shell
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BROWSER_ANDROID_CAST_WINDOW_ANDROID_H_