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Break down 'other' in FileBrowser.QuickView.FileType UMA to 'directory',
'no extension' and 'unknown extension'.

extension and a file with a .gn extension. Then check
values 59 through 62 inclusive

Bug: 772599
Test: Quick View and Open on a folder, a .zip file, a file without an
chrome: //histograms has 4 entries for FileBrowser.QuickView.FileType,
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Id13b8734e96b238bfb98b98b0062d1f0721180c7
Reviewed-on: https://chromium-review.googlesource.com/907992Reviewed-by: Naoki Fukino <fukino@chromium.org>
Commit-Queue: Sasha Morrissey <sashab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536027}