Latest drop of DroidSansFallback.ttf from Monotype

Update DroidSansFallback.ttf to ver 2.53.  This version contains
the following additional glyphs:
1) Currency: \u060B\u09F2\u09F3\u09FB\u0AF1\u0BF9\u17DB\u20B6-\u20B9
   \uA838\uFDFC
2) Geometric right arrow: \u25BA
3) CJK Ext A (about 6000 Simplified Chinese Glyphs)

Bug: 3315583
Bug: 4182541

Change-Id: I6c809626b02ef2fc0f07274b838434fb8cdf2bc2