Fixed other scenarios that were skipped

cms/djangoapps/contentstore/features/section.feature

@@ -26,11 +26,9 @@ Feature: Create Section
     And I save a new section release date
     Then the section release date is updated
 
-  # Skipped because Ubuntu ChromeDriver hangs on alert
-  @skip
   Scenario: Delete section
     Given I have opened a new course in Studio
     And I have added a new section
-    When I press the "section" delete icon
-    And I confirm the alert
+    When I confirm all alerts
+    And I press the "section" delete icon
     Then the section does not exist

cms/djangoapps/contentstore/features/section.py

@@ -69,8 +69,8 @@ def i_see_complete_section_name_with_quote_in_editor(step):
 
 @step('the section does not exist$')
 def section_does_not_exist(step):
-    css = 'span.section-name-span'
-    assert world.browser.is_element_not_present_by_css(css)
+    css = 'h3[data-name="My Section"]'
+    assert world.is_css_not_present(css)
 
 
 @step('I see a release date for my section$')

cms/djangoapps/contentstore/features/subsection.feature

@@ -32,12 +32,10 @@ Feature: Create Subsection
     And I reload the page
     Then I see the correct dates
 
-  # Skipped because Ubuntu ChromeDriver hangs on alert
-  @skip
   Scenario: Delete a subsection
     Given I have opened a new course section in Studio
     And I have added a new subsection
     And I see my subsection on the Courseware page
-    When I press the "subsection" delete icon
-    And I confirm the alert
+    When I confirm all alerts
+    And I press the "subsection" delete icon
     Then the subsection does not exist