Fix compilation error due to removal of implicit scoped_refptr to ptr conversion.

components/cronet/android/url_request_adapter.cc

Index: components/cronet/android/url_request_adapter.cc
diff --git a/components/cronet/android/url_request_adapter.cc b/components/cronet/android/url_request_adapter.cc
index 9d9e29b2ce3258ab2a86ee8e506eb99426c7731c..1d984f2c1cbb659bbc06699645173c83aa997e1f 100644
--- a/components/cronet/android/url_request_adapter.cc
+++ b/components/cronet/android/url_request_adapter.cc
@@ -210,8 +210,9 @@ void URLRequestAdapter::Read() {
     }
 
     int bytes_read;
-    if (url_request_->Read(
-            read_buffer_, read_buffer_->RemainingCapacity(), &bytes_read)) {
+    if (url_request_->Read(read_buffer_.get(),
+                           read_buffer_->RemainingCapacity(),
+                           &bytes_read)) {
       if (bytes_read == 0) {
         OnRequestSucceeded();
         break;