Add DejaVu Sans Mono (regular) font to third_party.

DEPS

Index: DEPS
diff --git a/DEPS b/DEPS
index 1f7f73ef7d03018a7572aa673d7426f4a1ae2063..d02c0ab07bd213ac51b2f2dd0517b5df78bdb2da 100644
--- a/DEPS
+++ b/DEPS
@@ -348,4 +348,15 @@ hooks = [
         'python', 'src/tools/go/download.py',
     ],
   },
+  # Pull DejaVu fonts using checked-in hashes.
+  {
+    'name': 'dejavu-fonts',
+    'pattern': '',
+    'action': [ 'download_from_google_storage',
+                '--no_resume',
+                '--no_auth',
+                '--bucket', 'mojo/dejavu-fonts',
+                '-s', 'src/third_party/dejavu-fonts-ttf-2.34/ttf/DejaVuSansMono.ttf.sha1',
+    ],
+  },
 ]