Remove self-executable Ruby scripts

Rather than running those directly, use IRB.

Mentioned IE + FFI + MRI issue no longer reproduces on Win 10 + IE11 +
MRI 2.3.

rb/lib/selenium/webdriver/common/platform.rb

@@ -206,17 +206,3 @@ def interfaces
     end # Platform
   end # WebDriver
 end # Selenium
-
-if $PROGRAM_NAME == __FILE__
-  p engine: Selenium::WebDriver::Platform.engine,
-    os: Selenium::WebDriver::Platform.os,
-    ruby_version: Selenium::WebDriver::Platform.ruby_version,
-    jruby?: Selenium::WebDriver::Platform.jruby?,
-    windows?: Selenium::WebDriver::Platform.windows?,
-    home: Selenium::WebDriver::Platform.home,
-    bitsize: Selenium::WebDriver::Platform.bitsize,
-    localhost: Selenium::WebDriver::Platform.localhost,
-    ip: Selenium::WebDriver::Platform.ip,
-    interfaces: Selenium::WebDriver::Platform.interfaces,
-    null_device: Selenium::WebDriver::Platform.null_device
-end

rb/spec/integration/selenium/webdriver/spec_support/rack_server.rb

@@ -33,10 +33,8 @@ def initialize(path, port = nil)
         end
 
         def start
-          if Platform.jruby?
+          if Platform.jruby? || Platform.windows?
             start_threaded
-          elsif Platform.windows?
-            start_windows
           else
             start_forked
           end
@@ -96,17 +94,6 @@ def start_threaded
           sleep 0.5
         end
 
-        def start_windows
-          if %w[ie internet_explorer].include? ENV['WD_SPEC_DRIVER']
-            # For IE, the combination of Windows + FFI + MRI seems to cause a
-            # deadlock with the get() call and the server thread.
-            # Workaround by running this file in a subprocess.
-            @process = ChildProcess.build('ruby', '-r', 'rubygems', __FILE__, @path, @port.to_s).start
-          else
-            start_threaded
-          end
-        end
-
         class TestApp
           BASIC_AUTH_CREDENTIALS = %w[test test].freeze
 
@@ -135,7 +122,3 @@ def call(env)
     end # SpecSupport
   end # WebDriver
 end # Selenium
-
-if $PROGRAM_NAME == __FILE__
-  Selenium::WebDriver::SpecSupport::RackServer.new(ARGV[0], ARGV[1]).run
-end