Comment # 5 on bug 4286 from Vasiliy Glazov

As a result:
1. Separate to two different packages for flash and widevinecdm plugins.

2. Package names: pepper-flash-plugin and widevinecdm-plugin.

3. Path:
/usr/lib64/chromium-browser/PepperFlash/ for x86_64
/usr/lib/chromium-browser/PepperFlash/ for i686
As these paths are in Fedora chromium package.

For widevinecdm:
/usr/lib64/chromium-browser/ for x86_64
/usr/lib/chromium-browser/ for i686

So QtWebEngine must add paths to chromium-browser!

4. Add ExclusiveArch: %{ix86} x86_64.

Is this OK?