[Android] Update the Crosswalk logo.

This patch is to update the crosswalk logo with new pictures.

BUG=XWALK-3125
(cherry picked from commit 8b5a1f949a274cb1f12943a20dd1c23e3bef646c)
Merge pull request #2715 from wuhengzhi/crosswalk-10

[Android] Update the Crosswalk logo.