Revert of Break peerconnection_jni.cc into multiple files, in "pc" directory.

webrtc/sdk/android/src/jni/pc/mediaconstraints_jni.h

-/*
- *  Copyright 2017 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.
- */
-
-#ifndef WEBRTC_SDK_ANDROID_SRC_JNI_PC_MEDIACONSTRAINTS_JNI_H_
-#define WEBRTC_SDK_ANDROID_SRC_JNI_PC_MEDIACONSTRAINTS_JNI_H_
-
-#include "webrtc/api/mediaconstraintsinterface.h"
-#include "webrtc/sdk/android/src/jni/jni_helpers.h"
-
-namespace webrtc_jni {
-
-// Wrapper for a Java MediaConstraints object.  Copies all needed data so when
-// the constructor returns the Java object is no longer needed.
-class MediaConstraintsJni : public webrtc::MediaConstraintsInterface {
- public:
-  MediaConstraintsJni(JNIEnv* jni, jobject j_constraints);
-  virtual ~MediaConstraintsJni() {}
-
-  // MediaConstraintsInterface.
-  const Constraints& GetMandatory() const override { return mandatory_; }
-  const Constraints& GetOptional() const override { return optional_; }
-
- private:
-  // Helper for translating a List<Pair<String, String>> to a Constraints.
-  static void PopulateConstraintsFromJavaPairList(JNIEnv* jni,
-                                                  jobject j_constraints,
-                                                  const char* field_name,
-                                                  Constraints* field);
-
-  Constraints mandatory_;
-  Constraints optional_;
-};
-
-}  // namespace webrtc_jni
-
-#endif  // WEBRTC_SDK_ANDROID_SRC_JNI_PC_MEDIACONSTRAINTS_JNI_H_