Fixes the cache lock issue.

net/http/http_transaction.h

Index: net/http/http_transaction.h
diff --git a/net/http/http_transaction.h b/net/http/http_transaction.h
index eff45d10c5648d618e4366a6ea91a398b06016b1..a003d92ef88776ecc4cc35a932d61009a659e522 100644
--- a/net/http/http_transaction.h
+++ b/net/http/http_transaction.h
@@ -120,6 +120,8 @@ class NET_EXPORT_PRIVATE HttpTransaction {
                    const CompletionCallback& callback) = 0;
 
   // Stops further caching of this request by the HTTP cache, if there is any.
+  // If there are multiple requests for this resource that are writing to the

[jkarlin, 2017/02/03 18:26:20]

I don't think this addition is necessary. It already states that this request
won't continue to write to the cache. It doesn't say that others won't.

[shivanisha, 2017/02/06 21:14:11]

Actually, if there are multiple transactions then its a no-op. Since every
request in SharedWriters need to be able to write to the cache, one of them
cannot stop writing.

+  // cache using SharedWriters, caching may not be stopped.
   virtual void StopCaching() = 0;
 
   // Gets the full request headers sent to the server.  This is guaranteed to