Need to escape file paths before we use it in GURL.
Need to escape file paths before we use it in GURL.

BUG=NONE
TEST=Download and save a file with uri special chars +/\@~!'"()#$&,:;=?%. The fileicon should display correctly.

Review URL: http://codereview.chromium.org/7377009

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@92644 0039d316-1c4b-4281-b951-d872f2087c98

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