Enable -Wall -Werror and fix 2 compile-errors it would introduce.

Change-Id: I9150969787f308152d49c82d31078df50deabdcd

BUG=chromium-os:13800
TEST=emerge-x86-mario speech_synthesis and emerge-arm-generic speech_synthesis both compile cleanly

Review URL: http://codereview.chromium.org/6812006
3 files changed