Android: Replace webrtc_jni namespace with nested jni namespace

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

Index: webrtc/sdk/android/src/jni/filevideocapturer_jni.cc
diff --git a/webrtc/sdk/android/src/jni/filevideocapturer_jni.cc b/webrtc/sdk/android/src/jni/filevideocapturer_jni.cc
index 69d62bcbbc72a11683df1a3b4c0a12723ef901c5..059dbeffc6fb6c5003a7c3ca405cf02dc09dbf14 100644
--- a/webrtc/sdk/android/src/jni/filevideocapturer_jni.cc
+++ b/webrtc/sdk/android/src/jni/filevideocapturer_jni.cc
@@ -14,7 +14,8 @@
 #include "webrtc/rtc_base/checks.h"
 #include "webrtc/rtc_base/logging.h"
 
-namespace webrtc_jni {
+namespace webrtc {
+namespace jni {
 
 extern "C" JNIEXPORT void JNICALL
 Java_org_webrtc_FileVideoCapturer_nativeI420ToNV21(JNIEnv* jni,
@@ -57,4 +58,5 @@ Java_org_webrtc_FileVideoCapturer_nativeI420ToNV21(JNIEnv* jni,
   }
 }
 
-}  // namespace webrtc_jni
+}  // namespace jni
+}  // namespace webrtc