Remove extensions_tests.gyp[i]

extensions/renderer/api/serial/data_receiver_unittest.cc

Index: extensions/renderer/api/serial/data_receiver_unittest.cc
diff --git a/extensions/renderer/api/serial/data_receiver_unittest.cc b/extensions/renderer/api/serial/data_receiver_unittest.cc
index 95a19fdc75bcdd844104c921acfe04c9f204d21b..274909933f2fdda7fb0a1fa3f0167133bb8ec252 100644
--- a/extensions/renderer/api/serial/data_receiver_unittest.cc
+++ b/extensions/renderer/api/serial/data_receiver_unittest.cc
@@ -116,9 +116,9 @@ class DataReceiverTest : public ApiTestBase {
     DCHECK(buffer->GetSize() >= static_cast<uint32_t>(data.size()));
     memcpy(buffer->GetData(), data.c_str(), data.size());
     if (error)
-      buffer->DoneWithError(data.size(), error);
+      buffer->DoneWithError(static_cast<uint32_t>(data.size()), error);
     else
-      buffer->Done(data.size());
+      buffer->Done(static_cast<uint32_t>(data.size()));
   }
 
   scoped_refptr<device::DataSourceSender> sender_;