Fixes for new folder option of advanced filesystem. Fix new folder button position. Disallow / in folder names. Disallow creation of folders except under Downloads. Disallow saving of files except under Downloads. Miscellaneous cleanup. BUG=chromium-os:11498 TEST=New folder button should not overlap the 'File name' label any more. Creating folders in arbitrary locations using folder names with ../../ will not work. Creating folders outside of the file shelf will not work. 
Fixes for new folder option of advanced filesystem.
Fix new folder button position.
Disallow / in folder names.
Disallow creation of folders except under Downloads.
Disallow saving of files except under Downloads.
Miscellaneous cleanup.
BUG=chromium-os:11498
TEST=New folder button should not overlap the 'File name' label any more. Creating folders in arbitrary locations using folder names with ../../ will not work. Creating folders outside of the file shelf will not work. 

Review URL: http://codereview.chromium.org/4145014

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@74218 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