Remove explicit JNI references by adding UrlRequest.readFromUploadChannel callback.

components/cronet/android/cronet_jni.cc

Index: components/cronet/android/cronet_jni.cc
diff --git a/components/cronet/android/cronet_jni.cc b/components/cronet/android/cronet_jni.cc
index 7fe299ddf8e17f20377411bfd56652d2adaee9a4..f67425bc95654489d8a12ce7ee89a83f1278410d 100644
--- a/components/cronet/android/cronet_jni.cc
+++ b/components/cronet/android/cronet_jni.cc
@@ -8,7 +8,6 @@
 #include "base/at_exit.h"
 #include "components/cronet/android/org_chromium_net_UrlRequest.h"
 #include "components/cronet/android/org_chromium_net_UrlRequestContext.h"
-#include "components/cronet/android/wrapped_channel_upload_element_reader.h"
 #include "net/android/net_jni_registrar.h"
 #include "url/android/url_jni_registrar.h"
 
@@ -24,7 +23,6 @@ const base::android::RegistrationMethod kCronetRegisteredMethods[] = {
   {"UrlAndroid", url::android::RegisterJni},
   {"UrlRequest", cronet::UrlRequestRegisterJni},
   {"UrlRequestContext", cronet::UrlRequestContextRegisterJni},
-  {"WrappedChannel", cronet::WrappedChannelRegisterJni},
 };
 
 base::AtExitManager* g_at_exit_manager = NULL;