Introduce and use OS matching constants

modules/exploits/android/browser/webview_addjavascriptinterface.rb

@@ -11,7 +11,7 @@ class Metasploit3 < Msf::Exploit::Remote
   include Msf::Exploit::Remote::BrowserAutopwn
 
   autopwn_info({
-    :os_name    => "Android",
+    :os_name    => OperatingSystems::Match::ANDROID,
     :arch       => ARCH_ARMLE,
     :javascript => true,
     :rank       => ExcellentRanking,
@@ -66,7 +66,7 @@ class Metasploit3 < Msf::Exploit::Remote
       'DefaultTarget'  => 0,
       'BrowserRequirements' => {
         :source  => 'script',
-        :os_name => 'Android',
+        :os_name => OperatingSystems::Match::ANDROID,
         :arch    => ARCH_ARMLE
       }
     ))