Fix bug where symbol is not accepting on delete cookie

Author: aguspe

rb/lib/selenium/webdriver/remote/bridge.rb

@@ -323,7 +323,7 @@ def add_cookie(cookie)
         end
 
         def delete_cookie(name)
-          raise ArgumentError, 'Cookie name cannot be null or empty' if name.nil? || name.strip.empty?
+          raise ArgumentError, 'Cookie name cannot be null or empty' if name.nil? || name.to_s.strip.empty?
 
           execute :delete_cookie, name: name
         end

rb/spec/integration/selenium/webdriver/manager_spec.rb

@@ -268,6 +268,12 @@ module WebDriver
           expect { driver.manage.delete_cookie(nil) }
             .to raise_error(ArgumentError, /Cookie name cannot be null or empty/)
         end
+
+        it 'allows deleting a cookies using a symbol' do
+          driver.manage.add_cookie name: :foo, value: 'bar'
+          driver.manage.delete_cookie(:foo)
+          expect(driver.manage.all_cookies).to be_empty
+        end
       end
     end # Options
   end # WebDriver