Fix a high frequency chrome frame crasher which occurs while uploading UMA data. The crash occcurs while processing a proxy change request and specifically occurs while invoking on the NetLog instance maintained by a chrome frame url request context instantiated specifically to upload data. The proxy service is a ref counted object and the net log instance is not which leads to a race condition if the netlog instance is destroyed before the proxy service.
Fix a high frequency chrome frame crasher which occurs while uploading UMA data. The crash
occcurs while processing a proxy change request and specifically occurs while invoking on
the NetLog instance maintained by a chrome frame url request context instantiated specifically
to upload data. The proxy service is a ref counted object and the net log instance is not
which leads to a race condition if the netlog instance is destroyed before the proxy service.

Fix is to not create a netlog instance for chrome frame uma requests.

Fixes bug http://code.google.com/p/chromium/issues/detail?id=60203

Bug=60203

Review URL: http://codereview.chromium.org/3985006

git-svn-id: http://src.chromium.org/svn/trunk/src@63571 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 80da19f5cf4b77d9e377badae55f51d62466c156
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser