clean app helper

* remove unused method
* simplify gravatar_icon

app/helpers/application_helper.rb

@@ -39,18 +39,10 @@ module ApplicationHelper
     else
       gravatar_url = request.ssl? ? Gitlab.config.gravatar.ssl_url : Gitlab.config.gravatar.plain_url
       user_email.strip!
-      sprintf(gravatar_url, {:hash => Digest::MD5.hexdigest(user_email.downcase), :email => URI.escape(user_email), :size => size})
+      sprintf gravatar_url, hash: Digest::MD5.hexdigest(user_email.downcase), size: size
     end
   end
 
-  def request_protocol
-    request.ssl? ? "https" : "http"
-  end
-
-  def web_app_url
-    "#{request_protocol}://#{Gitlab.config.gitlab.host}/"
-  end
-
   def last_commit(project)
     if project.repo_exists?
       time_ago_in_words(project.repository.commit.committed_date) + " ago"