Make HidConnection::Read reentrancy safe

device/hid/hid_connection.cc

Index: device/hid/hid_connection.cc
diff --git a/device/hid/hid_connection.cc b/device/hid/hid_connection.cc
index 5a904fe7cfa75ed6c4225a10f3db80e1981f4091..9d5ee20f20bc0ec81f2e6b81f4337e9f9a32fc97 100644
--- a/device/hid/hid_connection.cc
+++ b/device/hid/hid_connection.cc
@@ -170,20 +170,6 @@ void HidConnection::SendFeatureReport(scoped_refptr<net::IOBuffer> buffer,
   PlatformSendFeatureReport(buffer, size, callback);
 }
 
-bool HidConnection::CompleteRead(scoped_refptr<net::IOBuffer> buffer,
-                                 size_t size,
-                                 const ReadCallback& callback) {
-  DCHECK_GE(size, 1u);
-  uint8_t report_id = buffer->data()[0];
-  if (IsReportIdProtected(report_id)) {
-    HID_LOG(EVENT) << "Filtered a protected input report.";
-    return false;
-  }
-
-  callback.Run(true, buffer, size);
-  return true;
-}
-
 bool HidConnection::IsReportIdProtected(uint8_t report_id) {
   HidCollectionInfo collection_info;
   if (FindCollectionByReportId(device_info_->collections(), report_id,