Return NOT_FOUND error for an attempt to create a file under nonexistent directory.
Return NOT_FOUND error for an attempt to create a file under nonexistent directory.

BUG=none
TEST=fast/filesystem/op-get-entry.html

Review URL: http://codereview.chromium.org/3729001

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@62229 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