Android: Replace webrtc_jni namespace with nested jni namespace

webrtc/examples/unityplugin/classreferenceholder.h

 /*
  *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-// This is a supplement of webrtc_jni::ClassReferenceHolder.
+// This is a supplement of webrtc::jni::ClassReferenceHolder.
 // The purpose of this ClassReferenceHolder is to load the example
 // specific java class into JNI c++ side, so that our c++ code can
 // call those java functions.
 
 #ifndef WEBRTC_EXAMPLES_UNITYPLUGIN_CLASSREFERENCEHOLDER_H_
 #define WEBRTC_EXAMPLES_UNITYPLUGIN_CLASSREFERENCEHOLDER_H_
 
 #include <jni.h>
 #include <map>
 #include <string>
 #include <vector>
 
 namespace unity_plugin {
 
 // LoadGlobalClassReferenceHolder must be called in JNI_OnLoad.
 void LoadGlobalClassReferenceHolder();
 // FreeGlobalClassReferenceHolder must be called in JNI_UnLoad.
 void FreeGlobalClassReferenceHolder();
 
 // Returns a global reference guaranteed to be valid for the lifetime of the
 // process.
 jclass FindClass(JNIEnv* jni, const char* name);
 
 }  // namespace unity_plugin
 
 #endif  // WEBRTC_EXAMPLES_UNITYPLUGIN_CLASSREFERENCEHOLDER_H_