Fix JsonPrefStoreTest.NonExistentFile.
Fix JsonPrefStoreTest.NonExistentFile.

For a non-existent file, the PrefStore is *not* read-only, and writing would create the pref file.

I'm going to add a second test for reading a broken file afterwards.

TBR=pam@chromium.org
TEST=JsonPrefStoreTest.NonExistentFile

Review URL: http://codereview.chromium.org/1521041

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@45029 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