(3) Rename files to snake_case: move the files

Mechanically generated with this command:

tools_webrtc/do-rename.sh move all-renames.txt

Bug: webrtc:10159
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I8b05b6eab9b9d18b29c2199bbea239e9add1e690
Reviewed-on: https://webrtc-review.googlesource.com/c/115481
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26225}

examples/unityplugin/classreferenceholder.h

@@ -1,37 +0,0 @@
-/*
- *  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.
-// 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 EXAMPLES_UNITYPLUGIN_CLASSREFERENCEHOLDER_H_
-#define 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  // EXAMPLES_UNITYPLUGIN_CLASSREFERENCEHOLDER_H_