Fix a null pointer crasher.

webkit/appcache/appcache_response.cc

Index: webkit/appcache/appcache_response.cc
===================================================================
--- webkit/appcache/appcache_response.cc	(revision 88004)
+++ webkit/appcache/appcache_response.cc	(working copy)
@@ -214,12 +214,16 @@
 void AppCacheResponseReader::OnIOComplete(int result) {
   if (result >= 0) {
     if (info_buffer_.get()) {
-      // Allocate and deserialize the http info structure.
+      // Deserialize the http info structure.
       Pickle pickle(buffer_->data(), result);
+      scoped_ptr<net::HttpResponseInfo> info(new net::HttpResponseInfo);
       bool response_truncated = false;
-      info_buffer_->http_info.reset(new net::HttpResponseInfo);
-      info_buffer_->http_info->InitFromPickle(pickle, &response_truncated);
+      if (!info->InitFromPickle(pickle, &response_truncated)) {
+        InvokeUserCompletionCallback(net::ERR_FAILED);
+        return;
+      }
       DCHECK(!response_truncated);
+      info_buffer_->http_info.reset(info.release());
 
       // Also return the size of the response body
       DCHECK(entry_);