Add more OWNERS to c/b/c/f.

Per git log. Numbers of CLs:
    84  kinaba@chromium.org
    50  hirono@chromium.org
    25  mtomasz@chromium.org
    24  yoshiki@chromium.org
    14  hirono
    13  hidehiko@chromium.org
    11  jamescook@chromium.org
    11  satorux@chromium.org
    10  fukino@chromium.org

TEST=Not related.
BUG=None

Review URL: https://codereview.chromium.org/697553002

Cr-Commit-Position: refs/heads/master@{#302239}

chrome/browser/chromeos/file_manager/OWNERS

 hashimoto@chromium.org
+hirono@chromium.org
 kinaba@chromium.org
 mtomasz@chromium.org
 satorux@chromium.org
 yoshiki@chromium.org
+
 per-file file_manager_browsertest.cc=fukino@chromium.org
-per-file file_manager_browsertest.cc=hirono@chromium.org
+per-file file_manager_jstest.cc=fukino@chromium.org