Use FilePath::Extension instead of the deprecated file_util::GetFileExtensionFromPath. Part 2.
Use FilePath::Extension instead of the deprecated file_util::GetFileExtensionFromPath. Part 2.

Use it in one place in shell_dialogs_win.cc

BUG=24672
TEST=trybots

Review URL: http://codereview.chromium.org/6269023

git-svn-id: http://src.chromium.org/svn/trunk/src@73031 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: b7a67fb60795ce189ec53269816f4137a4a15203
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