spec: fix brittle specs (chrome build)

refs:
spec/selenium/announcements/announcements_teacher_spec.rb:260
spec/selenium/quizzes/quizzes_term_course_section_hierarchy_spec.rb:146

Change-Id: I9f65f08df65f2fa536d710247bbedf5f27e159cd
Reviewed-on: https://gerrit.instructure.com/99480
Reviewed-by: Pedro Fajardo <pfajardo@instructure.com>
Tested-by: Jenkins
Product-Review: August Thornton <august@instructure.com>
QA-Review: August Thornton <august@instructure.com>

spec/selenium/announcements/announcements_teacher_spec.rb

@@ -263,7 +263,8 @@ describe "announcements" do
       f('.discussion-reply-action').click
       entry_text = 'new entry text'
       type_in_tiny('textarea', entry_text)
-      fj("button[type=submit]").click
+      f('button[type=submit]').click
+      wait_for_ajax_requests
       expect(DiscussionEntry.last.message).to include(entry_text)
     end
 

spec/selenium/quizzes/quizzes_term_course_section_hierarchy_spec.rb

@@ -44,7 +44,9 @@ describe "quizzes section hierarchy" do
     # make sure it does not create a blank submissions
     expect(f("#content")).not_to contain_css('.quiz_score')
     expect(f("#content")).not_to contain_css('.quiz_duration')
-    expect_new_page_load(true) { f('#section-tabs .quizzes').click }
+    f('#section-tabs .quizzes').click
+    accept_alert
+    wait_for_ajaximations
   end
 
   context "section overrides course and term hierarchy" do