Fix the Android compile.

Be warned, fellow travellers, Android cares more about warnings than
other platforms.

TBR=
BUG=

Review URL: https://codereview.chromium.org/81273003

git-svn-id: svn://svn.chromium.org/blink/trunk@162483 bbb929c8-8fbe-4397-9dbb-9b2b20218538