Explicitly add python-numpy dependency to install-build-deps.

build/install-build-deps.sh

Index: build/install-build-deps.sh
diff --git a/build/install-build-deps.sh b/build/install-build-deps.sh
index f28409bc092bd7d2f952a441bf7ca34f94ad9379..3093505ae72e0acc5720121714245293a0b80a6d 100755
--- a/build/install-build-deps.sh
+++ b/build/install-build-deps.sh
@@ -105,10 +105,10 @@ dev_list="apache2.2-bin bison cdbs curl dpkg-dev elfutils devscripts fakeroot
           libpulse-dev libsctp-dev libspeechd-dev libsqlite3-dev libssl-dev
           libudev-dev libwww-perl libxslt1-dev libxss-dev libxt-dev libxtst-dev
           mesa-common-dev openbox patch perl php5-cgi pkg-config python
-          python-cherrypy3 python-crypto python-dev python-opencv python-openssl
-          python-psutil rpm ruby subversion ttf-dejavu-core ttf-indic-fonts
-          ttf-kochi-gothic ttf-kochi-mincho wdiff xfonts-mathml zip
-          $chromeos_dev_list"
+          python-cherrypy3 python-crypto python-dev python-numpy python-opencv
+          python-openssl python-psutil rpm ruby subversion ttf-dejavu-core
+          ttf-indic-fonts ttf-kochi-gothic ttf-kochi-mincho wdiff xfonts-mathml
+          zip $chromeos_dev_list"
 
 # 64-bit systems need a minimum set of 32-bit compat packages for the pre-built
 # NaCl binaries.