net: Implement canceling of all async operations in FileStream.

net/base/file_stream.h

Index: net/base/file_stream.h
===================================================================
--- net/base/file_stream.h	(revision 147715)
+++ net/base/file_stream.h	(working copy)
@@ -40,7 +40,9 @@
   // |net_log| is the net log pointer to use to create a |BoundNetLog|.  May be
   // NULL if logging is not needed.
   // The already opened file will not be automatically closed when FileStream
-  // is destructed.
+  // is destroyed.
+  // Note: new FileStream object takes ownership of the PlatformFile and will
+  // close it on destruction.
   FileStream(base::PlatformFile file, int flags, net::NetLog* net_log);
 
   // If the file stream was opened with Open() or OpenSync(), the underlying
@@ -61,8 +63,8 @@
 
   // Call this method to close the FileStream synchronously.
   // It is OK to call CloseSync() multiple times.  Redundant calls are
-  // ignored. Note that if there are any pending async operations, they'll
-  // be aborted.
+  // ignored. Note that if there are any pending async operations, then
+  // behavior of this method is equivalent to CloseAndCancelAsync().

[willchan no longer on Chromium, 2012/07/27 21:19:47]

You can undo this comment change, right?

   virtual void CloseSync();
 
   // Call this method to open the FileStream asynchronously.  The remaining