Merge pull request #100 from Mifrill/issue#89-resolve-warnings

Issue#89 resolve warnings

Author: route

lib/ferrum/browser/process.rb

@@ -64,6 +64,7 @@ def initialize(options)
           return
         end
 
+        @user_data_dir = nil
         @logger = options[:logger]
         @process_timeout = options.fetch(:process_timeout, PROCESS_TIMEOUT)
 

lib/ferrum/context.rb

@@ -42,9 +42,9 @@ def create_page
     end
 
     def create_target
-      target_id = @browser.command("Target.createTarget",
-                                   browserContextId: @id,
-                                   url: "about:blank")["targetId"]
+      @browser.command("Target.createTarget",
+                       browserContextId: @id,
+                       url: "about:blank")
       target = @pendings.take(@browser.timeout)
       raise NoSuchTargetError unless target.is_a?(Target)
       @targets[target.id] = target