Android: Replace webrtc_jni namespace with nested jni namespace

webrtc/sdk/android/src/jni/nv12buffer_jni.cc

Index: webrtc/sdk/android/src/jni/nv12buffer_jni.cc
diff --git a/webrtc/sdk/android/src/jni/nv12buffer_jni.cc b/webrtc/sdk/android/src/jni/nv12buffer_jni.cc
index e0aab9b8a3e9734166916e8060dfc1ee667e88d2..37eb3357859aec19e1e38b8383cd722b9e139a00 100644
--- a/webrtc/sdk/android/src/jni/nv12buffer_jni.cc
+++ b/webrtc/sdk/android/src/jni/nv12buffer_jni.cc
@@ -16,7 +16,8 @@
 
 #include "webrtc/rtc_base/checks.h"
 
-namespace webrtc_jni {
+namespace webrtc {
+namespace jni {
 
 extern "C" JNIEXPORT void JNICALL
 Java_org_webrtc_NV12Buffer_nativeCropAndScale(JNIEnv* jni,
@@ -73,4 +74,5 @@ Java_org_webrtc_NV12Buffer_nativeCropAndScale(JNIEnv* jni,
                     scale_height, libyuv::kFilterBox);
 }
 
-}  // namespace webrtc_jni
+}  // namespace jni
+}  // namespace webrtc