UploadDataStream:  Update ResetInternal() documentation.

NOTRY=true

Bug: 822717
Change-Id: I21cd2bed496cef2d8e94d1eebc7354cfa5b90ddd
Reviewed-on: https://chromium-review.googlesource.com/978385
Commit-Queue: Matt Menke <[email protected]>
Reviewed-by: Helen Li <[email protected]>
Cr-Commit-Position: refs/heads/master@{#545565}
diff --git a/net/base/upload_data_stream.h b/net/base/upload_data_stream.h
index 1c6e554b..b9645ec 100644
--- a/net/base/upload_data_stream.h
+++ b/net/base/upload_data_stream.h
@@ -124,7 +124,7 @@
   virtual int ReadInternal(IOBuffer* buf, int buf_len) = 0;
 
   // Resets state and cancels any pending callbacks. Guaranteed to be called
-  // before all but the first call to InitInternal.
+  // at least once before every call to InitInternal.
   virtual void ResetInternal() = 0;
 
   uint64_t total_size_;