Guard against directory traversal due to evil message from compromised renderer.
Guard against directory traversal due to evil message from compromised
renderer.

TEST=NONE
BUG=29828

Review URL: http://codereview.chromium.org/467061

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@34264 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser