Update setup_dev_packages to also emerge hard-host-depends so that users will get latest packages.

BUG=chromium-os:8185
TEST=Run script, verify hard-host-depends is emerged.

Change-Id: I6cb16de2712769713e038daa5f57722190079a46

Review URL: http://codereview.chromium.org/4117003
diff --git a/setup_dev_packages b/setup_dev_packages
index 4709d11..d5ddcc7 100755
--- a/setup_dev_packages
+++ b/setup_dev_packages
@@ -7,6 +7,7 @@
 set -ex
 
 sudo USE="-crash cros-debug" emerge -DNauv1 \
+  chromeos-base/hard-host-depends \
   chromeos-base/libchrome \
   chromeos-base/metrics \
   dev-cpp/gmock \