Eliminate needless use of reflection

The minSdkVersion was recently increased from 8 to 15.

WebSettings.setBlockNetworkLoads has been publicly available
since API level 8 (Froyo).

StrictMode has been publicly available since API level 9
(Gingerbread).
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of github.com:bumpus/k-9