Fix a type mistake

long in c++ is 32 bits. We need 64 bits here.

Review-Url: https://codereview.webrtc.org/2326253002
Cr-Commit-Position: refs/heads/master@{#14176}
diff --git a/webrtc/api/android/jni/androidnetworkmonitor_jni.h b/webrtc/api/android/jni/androidnetworkmonitor_jni.h
index f164986..3ce6ff4 100644
--- a/webrtc/api/android/jni/androidnetworkmonitor_jni.h
+++ b/webrtc/api/android/jni/androidnetworkmonitor_jni.h
@@ -21,7 +21,7 @@
 
 namespace webrtc_jni {
 
-typedef long NetworkHandle;
+typedef int64_t NetworkHandle;
 
 // c++ equivalent of java NetworkMonitorAutoDetect.ConnectionType.
 enum NetworkType {