Android: Remove unneeded RegisterNatives() calls

base/android/content_uri_utils.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 BASE_ANDROID_CONTENT_URI_UTILS_H_
 #define BASE_ANDROID_CONTENT_URI_UTILS_H_
 
 #include <jni.h>
 
 #include "base/base_export.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 
 namespace base {
 
-bool RegisterContentUriUtils(JNIEnv* env);
-
 // Opens a content URI for read and returns the file descriptor to the caller.
 // Returns -1 if the URI is invalid.
 BASE_EXPORT File OpenContentUriForRead(const FilePath& content_uri);
 
 // Check whether a content URI exists.
 BASE_EXPORT bool ContentUriExists(const FilePath& content_uri);
 
 // Gets MIME type from a content URI. Returns an empty string if the URI is
 // invalid.
 BASE_EXPORT std::string GetContentUriMimeType(const FilePath& content_uri);
 
 }  // namespace base
 
 #endif  // BASE_ANDROID_CONTENT_URI_UTILS_H_