Obliterate legacy cronet API. All of its users have been migrated.

components/cronet/android/cronet_library_loader.cc

Index: components/cronet/android/cronet_library_loader.cc
diff --git a/components/cronet/android/cronet_library_loader.cc b/components/cronet/android/cronet_library_loader.cc
index 79d69392d17c0d3a7c064f6a2105ba1354724c56..f5d59ff6ff6877f11a17964a8948447f0f716a9b 100644
--- a/components/cronet/android/cronet_library_loader.cc
+++ b/components/cronet/android/cronet_library_loader.cc
@@ -19,7 +19,6 @@
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "components/cronet/android/chromium_url_request.h"
-#include "components/cronet/android/chromium_url_request_context.h"
 #include "components/cronet/android/cronet_bidirectional_stream_adapter.h"
 #include "components/cronet/android/cronet_upload_data_stream_adapter.h"
 #include "components/cronet/android/cronet_url_request_adapter.h"
@@ -44,8 +43,6 @@ namespace {
 
 const base::android::RegistrationMethod kCronetRegisteredMethods[] = {
     {"BaseAndroid", base::android::RegisterJni},
-    {"ChromiumUrlRequest", ChromiumUrlRequestRegisterJni},
-    {"ChromiumUrlRequestContext", ChromiumUrlRequestContextRegisterJni},
     {"CronetBidirectionalStreamAdapter",
      CronetBidirectionalStreamAdapter::RegisterJni},
     {"CronetLibraryLoader", RegisterNativesImpl},