Como usuario root:

1--> Instala el repositorio el-6 y Google Chromium.

cd /etc/yum.repos.d
wget http://people.centos.org/hughesjr/chromium/6/chromium-el6.repo
yum -y install chromium

2--> Instala Pepper Flash.

wget https://raw.github.com/hughesjr/chromium_el_builder/master/chrome_pepperflash_copy.sh
chmod +x chrome_pepperflash_copy.sh
./chrome_pepperflash_copy.sh

3--> Instala el plugin Google Chrome PDF Viewer.

wget https://raw.github.com/hughesjr/chromium_el_builder/master/chrome_libpdf_copy.sh
chmod +x chrome_libpdf_copy.sh
./chrome_libpdf_copy.sh

4--> Elimina temporales.

rm *.sh

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