Revert 223482 "Simplify PPB_NetworkMonitor proxy."

> Simplify PPB_NetworkMonitor proxy.
> 
> The new proxy is based on ppapi::proxy::PluginResource and 
> ppapi::host::ResourceHost which simplifies code significantly. Also 
> the permission check is consistent with socket APIs now.
> 
> BUG=281781
> 
> Review URL: https://chromiumcodereview.appspot.com/23819033

TBR=sergeyu@chromium.org

Review URL: https://codereview.chromium.org/23463037

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@223484 0039d316-1c4b-4281-b951-d872f2087c98
28 files changed