Dont pass extraneous chrome variables to other browsers

Extract remote_grid_credentials

qa/qa/runtime/browser.rb

@@ -57,6 +57,8 @@ module QA
           # QA::Runtime::Env.browser.capitalize will work for every driver type except PhantomJS.
           # We will have no use to use PhantomJS so this shouldn't be a problem.
           options = Selenium::WebDriver.const_get(QA::Runtime::Env.browser.capitalize)::Options.new
+
+          if QA::Runtime::Env.browser == :chrome
             options.add_argument("window-size=1240,1680")
 
             # Chrome won't work properly in a Docker container in sandbox mode
@@ -70,6 +72,7 @@ module QA
               # https://developers.google.com/web/updates/2017/04/headless-chrome#cli
               options.add_argument("disable-gpu")
             end
+          end
 
           # Use the same profile on QA runs if CHROME_REUSE_PROFILE is true.
           # Useful to speed up local QA.

qa/qa/runtime/env.rb

@@ -62,7 +62,10 @@ module QA
         # - "http://user:pass@somehost.com/wd/hub"
         # - "https://user:pass@somehost.com:443/wd/hub"
         # - "http://localhost:4444/wd/hub"
-        "#{remote_grid_protocol}://#{"#{remote_grid_username}:#{remote_grid_access_key}@" if remote_grid_username}#{ENV['QA_REMOTE_GRID']}/wd/hub" if ENV['QA_REMOTE_GRID']
+
+        return unless ENV['QA_REMOTE_GRID']
+
+        "#{remote_grid_protocol}://#{remote_grid_credentials}#{ENV['QA_REMOTE_GRID']}/wd/hub"
       end
 
       def remote_grid_username
@@ -183,6 +186,10 @@ module QA
 
       private
 
+      def remote_grid_credentials
+        remote_grid_username ? "#{remote_grid_username}:#{remote_grid_access_key}@" : ''
+      end
+
       def enabled?(value, default: true)
         return default if value.nil?