Disabled hidpi option in Chromium. Cleanup widevine handling so that third party addon package can exist. Add Requires(post) for selinux deps. Fix provides/requires to not include private libs.

On 2016-08-04 Google released Chrome 52.0.2743.116 which fixes at least 8 security issues: CVE-2016-5141, CVE-2016-5142, CVE-2016-5139, CVE-2016-5140, CVE-2016-5145, CVE-2016-5143 and CVE-2016-5144.

Additionally, this update:

• Splits libmedia and libffmpeg into the libs-media subpackage, so that it can be replaced by non-Fedora repos to provide additional codecs.
• Enables gtk3 support
• Adds additional ICU Text codec aliases (from openSUSE via Russian Fedora)
• Uses PIE in the Linux sandbox (from openSUSE via Russian Fedora)
• Enables ARM CPU detection for webrtc (from archlinux via Russian Fedora)
• Does not force -m32 in icu compile on ARM (from archlinux via Russian Fedora)
• Enables fpic on linux
• Enables hidpi
• Enables touch_ui
• Adds chromedriver subpackage (from Russian Fedora)
• Sets default master_preferences location to /etc/chromium (and includes master_preferences file)
• Creates PepperFlash directory where plugin needs to live if user has it
• Improves translations in chromium-browser.desktop (from Russian Fedora)
• Improves translation in Appinfo xml file (thanks to Richard Hughes)