[Cronet] Test the libcronet that's shipped, not libcronet_test

components/cronet/android/cronet_url_request_context_adapter.cc

Index: components/cronet/android/cronet_url_request_context_adapter.cc
diff --git a/components/cronet/android/cronet_url_request_context_adapter.cc b/components/cronet/android/cronet_url_request_context_adapter.cc
index ffe6089a2ec9ba859339a059dc1872bd46ca25d7..d47dc92bf0d1637735d3bbf819017da25da052a3 100644
--- a/components/cronet/android/cronet_url_request_context_adapter.cc
+++ b/components/cronet/android/cronet_url_request_context_adapter.cc
@@ -746,6 +746,12 @@ net::URLRequestContext* CronetURLRequestContextAdapter::GetURLRequestContext() {
   return context_.get();
 }
 
+jlong CronetURLRequestContextAdapter::GetUrlRequestContextForTesting(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& jcaller) {
+  return reinterpret_cast<jlong>(GetURLRequestContext());
+}
+
 void CronetURLRequestContextAdapter::PostTaskToNetworkThread(
     const tracked_objects::Location& posted_from,
     const base::Closure& callback) {