Update to Chromium revision 241258.
- Update tracing implementation to use the new file-based approach (issue #1157).

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk@1549 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
Windows: Improve "view source" implementation.

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk@1550 5089003a-bbd8-11dd-ad1f-f1f9622dbc98