Android: Replace webrtc_jni namespace with nested jni namespace

webrtc/sdk/android/src/jni/wrapped_native_i420_buffer.h

Index: webrtc/sdk/android/src/jni/wrapped_native_i420_buffer.h
diff --git a/webrtc/sdk/android/src/jni/wrapped_native_i420_buffer.h b/webrtc/sdk/android/src/jni/wrapped_native_i420_buffer.h
index 3eaedd6b05fdff7838c99572965448a0e3b825ca..024287799e7f3635e003b81c187888017bb33d67 100644
--- a/webrtc/sdk/android/src/jni/wrapped_native_i420_buffer.h
+++ b/webrtc/sdk/android/src/jni/wrapped_native_i420_buffer.h
@@ -15,14 +15,16 @@
 
 #include "webrtc/api/video/video_frame_buffer.h"
 
-namespace webrtc_jni {
+namespace webrtc {
+namespace jni {
 
 // This function wraps the C++ I420 buffer and returns a Java
 // VideoFrame.I420Buffer as a jobject.
 jobject WrapI420Buffer(
     JNIEnv* jni,
-    const rtc::scoped_refptr<webrtc::I420BufferInterface>& i420_buffer);
+    const rtc::scoped_refptr<I420BufferInterface>& i420_buffer);
 
-}  // namespace webrtc_jni
+}  // namespace jni
+}  // namespace webrtc
 
 #endif  // WEBRTC_SDK_ANDROID_SRC_JNI_WRAPPED_NATIVE_I420_BUFFER_H_